drop table if exists t1,t2,t3,t4;
drop database if exists mysqltest;
create table t1 (id int unsigned not null auto_increment, code tinyint unsigned not null, name char(20) not null, primary key (id), key (code), unique (name)) engine=innodb;
insert into t1 (code, name) values (1, 'Tim'), (1, 'Monty'), (2, 'David'), (2, 'Erik'), (3, 'Sasha'), (3, 'Jeremy'), (4, 'Matt');
select id, code, name from t1 order by id;
id	code	name
1	1	Tim
2	1	Monty
3	2	David
4	2	Erik
5	3	Sasha
6	3	Jeremy
7	4	Matt
update ignore t1 set id = 8, name = 'Sinisa' where id < 3;
select id, code, name from t1 order by id;
id	code	name
2	1	Monty
3	2	David
4	2	Erik
5	3	Sasha
6	3	Jeremy
7	4	Matt
8	1	Sinisa
update ignore t1 set id = id + 10, name = 'Ralph' where id < 4;
select id, code, name from t1 order by id;
id	code	name
3	2	David
4	2	Erik
5	3	Sasha
6	3	Jeremy
7	4	Matt
8	1	Sinisa
12	1	Ralph
drop table t1;
CREATE TABLE t1 (
id int(11) NOT NULL auto_increment,
parent_id int(11) DEFAULT '0' NOT NULL,
level tinyint(4) DEFAULT '0' NOT NULL,
PRIMARY KEY (id),
KEY parent_id (parent_id),
KEY level (level)
) engine=innodb;
INSERT INTO t1 VALUES (1,0,0),(3,1,1),(4,1,1),(8,2,2),(9,2,2),(17,3,2),(22,4,2),(24,4,2),(28,5,2),(29,5,2),(30,5,2),(31,6,2),(32,6,2),(33,6,2),(203,7,2),(202,7,2),(20,3,2),(157,0,0),(193,5,2),(40,7,2),(2,1,1),(15,2,2),(6,1,1),(34,6,2),(35,6,2),(16,3,2),(7,1,1),(36,7,2),(18,3,2),(26,5,2),(27,5,2),(183,4,2),(38,7,2),(25,5,2),(37,7,2),(21,4,2),(19,3,2),(5,1,1),(179,5,2);
update t1 set parent_id=parent_id+100;
select * from t1 where parent_id=102;
id	parent_id	level
8	102	2
9	102	2
15	102	2
update t1 set id=id+1000;
update t1 set id=1024 where id=1009;
Got one of the listed errors
select * from t1;
id	parent_id	level
1001	100	0
1002	101	1
1003	101	1
1004	101	1
1005	101	1
1006	101	1
1007	101	1
1008	102	2
1009	102	2
1015	102	2
1016	103	2
1017	103	2
1018	103	2
1019	103	2
1020	103	2
1021	104	2
1022	104	2
1024	104	2
1025	105	2
1026	105	2
1027	105	2
1028	105	2
1029	105	2
1030	105	2
1031	106	2
1032	106	2
1033	106	2
1034	106	2
1035	106	2
1036	107	2
1037	107	2
1038	107	2
1040	107	2
1157	100	0
1179	105	2
1183	104	2
1193	105	2
1202	107	2
1203	107	2
update ignore t1 set id=id+1;
select * from t1;
id	parent_id	level
1001	100	0
1002	101	1
1003	101	1
1004	101	1
1005	101	1
1006	101	1
1007	101	1
1008	102	2
1010	102	2
1015	102	2
1016	103	2
1017	103	2
1018	103	2
1019	103	2
1020	103	2
1021	104	2
1023	104	2
1024	104	2
1025	105	2
1026	105	2
1027	105	2
1028	105	2
1029	105	2
1030	105	2
1031	106	2
1032	106	2
1033	106	2
1034	106	2
1035	106	2
1036	107	2
1037	107	2
1039	107	2
1041	107	2
1158	100	0
1180	105	2
1184	104	2
1194	105	2
1202	107	2
1204	107	2
update ignore t1 set id=1023 where id=1010;
select * from t1 where parent_id=102;
id	parent_id	level
1008	102	2
1010	102	2
1015	102	2
explain select level from t1 where level=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	level	level	1	const	#	Using index
explain select level,id from t1 where level=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	level	level	1	const	#	Using index
explain select level,id,parent_id from t1 where level=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	level	level	1	const	#	
select level,id from t1 where level=1;
level	id
1	1002
1	1003
1	1004
1	1005
1	1006
1	1007
select level,id,parent_id from t1 where level=1;
level	id	parent_id
1	1002	101
1	1003	101
1	1004	101
1	1005	101
1	1006	101
1	1007	101
optimize table t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	note	Table does not support optimize, doing recreate + analyze instead
test.t1	optimize	status	OK
show keys from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_Comment
t1	0	PRIMARY	1	id	A	#	NULL	NULL		BTREE		
t1	1	parent_id	1	parent_id	A	#	NULL	NULL		BTREE		
t1	1	level	1	level	A	#	NULL	NULL		BTREE		
drop table t1;
CREATE TABLE t1 (
gesuchnr int(11) DEFAULT '0' NOT NULL,
benutzer_id int(11) DEFAULT '0' NOT NULL,
PRIMARY KEY (gesuchnr,benutzer_id)
) engine=innodb;
replace into t1 (gesuchnr,benutzer_id) values (2,1);
replace into t1 (gesuchnr,benutzer_id) values (1,1);
replace into t1 (gesuchnr,benutzer_id) values (1,1);
select * from t1;
gesuchnr	benutzer_id
1	1
2	1
drop table t1;
create table t1 (a int) engine=innodb;
insert into t1 values (1), (2);
optimize table t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	note	Table does not support optimize, doing recreate + analyze instead
test.t1	optimize	status	OK
delete from t1 where a = 1;
select * from t1;
a
2
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
drop table t1;
create table t1 (a int,b varchar(20)) engine=innodb;
insert into t1 values (1,""), (2,"testing");
delete from t1 where a = 1;
select * from t1;
a	b
2	testing
create index skr on t1 (a);
insert into t1 values (3,""), (4,"testing");
analyze table t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
show keys from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_Comment
t1	1	skr	1	a	A	#	NULL	NULL	YES	BTREE		
drop table t1;
create table t1 (a int,b varchar(20),key(a)) engine=innodb;
insert into t1 values (1,""), (2,"testing");
select * from t1 where a = 1;
a	b
1	
drop table t1;
create table t1 (n int not null primary key) engine=innodb;
set autocommit=0;
insert into t1 values (4);
rollback;
select n, "after rollback" from t1;
n	after rollback
insert into t1 values (4);
commit;
select n, "after commit" from t1;
n	after commit
4	after commit
commit;
insert into t1 values (5);
insert into t1 values (4);
ERROR 23000: Duplicate entry '4' for key 'PRIMARY'
commit;
select n, "after commit" from t1;
n	after commit
4	after commit
5	after commit
set autocommit=1;
insert into t1 values (6);
insert into t1 values (4);
ERROR 23000: Duplicate entry '4' for key 'PRIMARY'
select n from t1;
n
4
5
6
set autocommit=0;
begin;
savepoint `my_savepoint`;
insert into t1 values (7);
savepoint `savept2`;
insert into t1 values (3);
select n from t1;
n
3
4
5
6
7
savepoint savept3;
rollback to savepoint savept2;
rollback to savepoint savept3;
ERROR 42000: SAVEPOINT savept3 does not exist
rollback to savepoint savept2;
release savepoint `my_savepoint`;
select n from t1;
n
4
5
6
7
rollback to savepoint `my_savepoint`;
ERROR 42000: SAVEPOINT my_savepoint does not exist
rollback to savepoint savept2;
ERROR 42000: SAVEPOINT savept2 does not exist
insert into t1 values (8);
savepoint sv;
commit;
savepoint sv;
set autocommit=1;
rollback;
drop table t1;
create table t1 (n int not null primary key) engine=innodb;
start transaction;
insert into t1 values (4);
flush tables with read lock;
commit;
unlock tables;
commit;
select * from t1;
n
4
drop table t1;
create table t1 ( id int NOT NULL PRIMARY KEY, nom varchar(64)) engine=innodb;
begin;
insert into t1 values(1,'hamdouni');
select id as afterbegin_id,nom as afterbegin_nom from t1;
afterbegin_id	afterbegin_nom
1	hamdouni
rollback;
select id as afterrollback_id,nom as afterrollback_nom from t1;
afterrollback_id	afterrollback_nom
set autocommit=0;
insert into t1 values(2,'mysql');
select id as afterautocommit0_id,nom as afterautocommit0_nom from t1;
afterautocommit0_id	afterautocommit0_nom
2	mysql
rollback;
select id as afterrollback_id,nom as afterrollback_nom from t1;
afterrollback_id	afterrollback_nom
set autocommit=1;
drop table t1;
CREATE TABLE t1 (id char(8) not null primary key, val int not null) engine=innodb;
insert into t1 values ('pippo', 12);
insert into t1 values ('pippo', 12);
ERROR 23000: Duplicate entry 'pippo' for key 'PRIMARY'
delete from t1;
delete from t1 where id = 'pippo';
select * from t1;
id	val
insert into t1 values ('pippo', 12);
set autocommit=0;
delete from t1;
rollback;
select * from t1;
id	val
pippo	12
delete from t1;
commit;
select * from t1;
id	val
drop table t1;
create table t1 (a integer) engine=innodb;
start transaction;
rename table t1 to t2;
create table t1 (b integer) engine=innodb;
insert into t1 values (1);
rollback;
drop table t1;
rename table t2 to t1;
drop table t1;
set autocommit=1;
CREATE TABLE t1 (ID INTEGER NOT NULL PRIMARY KEY, NAME VARCHAR(64)) ENGINE=innodb;
INSERT INTO t1 VALUES (1, 'Jochen');
select * from t1;
ID	NAME
1	Jochen
drop table t1;
CREATE TABLE t1 ( _userid VARCHAR(60) NOT NULL PRIMARY KEY) ENGINE=innodb;
set autocommit=0;
INSERT INTO t1  SET _userid='marc@anyware.co.uk';
COMMIT;
SELECT * FROM t1;
_userid
marc@anyware.co.uk
SELECT _userid FROM t1 WHERE _userid='marc@anyware.co.uk';
_userid
marc@anyware.co.uk
drop table t1;
set autocommit=1;
CREATE TABLE t1 (
user_id int(10) DEFAULT '0' NOT NULL,
name varchar(100),
phone varchar(100),
ref_email varchar(100) DEFAULT '' NOT NULL,
detail varchar(200),
PRIMARY KEY (user_id,ref_email)
)engine=innodb;
INSERT INTO t1 VALUES (10292,'sanjeev','29153373','sansh777@hotmail.com','xxx'),(10292,'shirish','2333604','shirish@yahoo.com','ddsds'),(10292,'sonali','323232','sonali@bolly.com','filmstar');
select * from t1 where user_id=10292;
user_id	name	phone	ref_email	detail
10292	sanjeev	29153373	sansh777@hotmail.com	xxx
10292	shirish	2333604	shirish@yahoo.com	ddsds
10292	sonali	323232	sonali@bolly.com	filmstar
INSERT INTO t1 VALUES (10291,'sanjeev','29153373','sansh777@hotmail.com','xxx'),(10293,'shirish','2333604','shirish@yahoo.com','ddsds');
select * from t1 where user_id=10292;
user_id	name	phone	ref_email	detail
10292	sanjeev	29153373	sansh777@hotmail.com	xxx
10292	shirish	2333604	shirish@yahoo.com	ddsds
10292	sonali	323232	sonali@bolly.com	filmstar
select * from t1 where user_id>=10292;
user_id	name	phone	ref_email	detail
10292	sanjeev	29153373	sansh777@hotmail.com	xxx
10292	shirish	2333604	shirish@yahoo.com	ddsds
10292	sonali	323232	sonali@bolly.com	filmstar
10293	shirish	2333604	shirish@yahoo.com	ddsds
select * from t1 where user_id>10292;
user_id	name	phone	ref_email	detail
10293	shirish	2333604	shirish@yahoo.com	ddsds
select * from t1 where user_id<10292;
user_id	name	phone	ref_email	detail
10291	sanjeev	29153373	sansh777@hotmail.com	xxx
drop table t1;
CREATE TABLE t1 (a int not null, b int not null,c int not null,
key(a),primary key(a,b), unique(c),key(a),unique(b));
show index from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_Comment
t1	0	PRIMARY	1	a	A	#	NULL	NULL		BTREE		
t1	0	PRIMARY	2	b	A	#	NULL	NULL		BTREE		
t1	0	c	1	c	A	#	NULL	NULL		BTREE		
t1	0	b	1	b	A	#	NULL	NULL		BTREE		
t1	1	a	1	a	A	#	NULL	NULL		BTREE		
t1	1	a_2	1	a	A	#	NULL	NULL		BTREE		
drop table t1;
create table t1 (col1 int not null, col2 char(4) not null, primary key(col1));
alter table t1 engine=innodb;
insert into t1 values ('1','1'),('5','2'),('2','3'),('3','4'),('4','4');
select * from t1;
col1	col2
1	1
2	3
3	4
4	4
5	2
update t1 set col2='7' where col1='4';
select * from t1;
col1	col2
1	1
2	3
3	4
4	7
5	2
alter table t1 add co3 int not null;
select * from t1;
col1	col2	co3
1	1	0
2	3	0
3	4	0
4	7	0
5	2	0
update t1 set col2='9' where col1='2';
select * from t1;
col1	col2	co3
1	1	0
2	9	0
3	4	0
4	7	0
5	2	0
drop table t1;
create table t1 (a int not null , b int, primary key (a)) engine = innodb;
create table t2 (a int not null , b int, primary key (a)) engine = myisam;
insert into t1 VALUES (1,3) , (2,3), (3,3);
select * from t1;
a	b
1	3
2	3
3	3
insert into t2 select * from t1;
select * from t2;
a	b
1	3
2	3
3	3
delete from t1 where b = 3;
select * from t1;
a	b
insert into t1 select * from t2;
select * from t1;
a	b
1	3
2	3
3	3
select * from t2;
a	b
1	3
2	3
3	3
drop table t1,t2;
CREATE TABLE t1 (
user_name varchar(12),
password text,
subscribed char(1),
user_id int(11) DEFAULT '0' NOT NULL,
quota bigint(20),
weight double,
access_date date,
access_time time,
approved datetime,
dummy_primary_key int(11) NOT NULL auto_increment,
PRIMARY KEY (dummy_primary_key)
) ENGINE=innodb;
INSERT INTO t1 VALUES ('user_0','somepassword','N',0,0,0,'2000-09-07','23:06:59','2000-09-07 23:06:59',1);
INSERT INTO t1 VALUES ('user_1','somepassword','Y',1,1,1,'2000-09-07','23:06:59','2000-09-07 23:06:59',2);
INSERT INTO t1 VALUES ('user_2','somepassword','N',2,2,1.4142135623731,'2000-09-07','23:06:59','2000-09-07 23:06:59',3);
INSERT INTO t1 VALUES ('user_3','somepassword','Y',3,3,1.7320508075689,'2000-09-07','23:06:59','2000-09-07 23:06:59',4);
INSERT INTO t1 VALUES ('user_4','somepassword','N',4,4,2,'2000-09-07','23:06:59','2000-09-07 23:06:59',5);
select  user_name, password , subscribed, user_id, quota, weight, access_date, access_time, approved, dummy_primary_key from t1 order by user_name;
user_name	password	subscribed	user_id	quota	weight	access_date	access_time	approved	dummy_primary_key
user_0	somepassword	N	0	0	0	2000-09-07	23:06:59	2000-09-07 23:06:59	1
user_1	somepassword	Y	1	1	1	2000-09-07	23:06:59	2000-09-07 23:06:59	2
user_2	somepassword	N	2	2	1.4142135623731	2000-09-07	23:06:59	2000-09-07 23:06:59	3
user_3	somepassword	Y	3	3	1.7320508075689	2000-09-07	23:06:59	2000-09-07 23:06:59	4
user_4	somepassword	N	4	4	2	2000-09-07	23:06:59	2000-09-07 23:06:59	5
drop table t1;
CREATE TABLE t1 (
id int(11) NOT NULL auto_increment,
parent_id int(11) DEFAULT '0' NOT NULL,
level tinyint(4) DEFAULT '0' NOT NULL,
KEY (id),
KEY parent_id (parent_id),
KEY level (level)
) engine=innodb;
INSERT INTO t1 VALUES (1,0,0),(3,1,1),(4,1,1),(8,2,2),(9,2,2),(17,3,2),(22,4,2),(24,4,2),(28,5,2),(29,5,2),(30,5,2),(31,6,2),(32,6,2),(33,6,2),(203,7,2),(202,7,2),(20,3,2),(157,0,0),(193,5,2),(40,7,2),(2,1,1),(15,2,2),(6,1,1),(34,6,2),(35,6,2),(16,3,2),(7,1,1),(36,7,2),(18,3,2),(26,5,2),(27,5,2),(183,4,2),(38,7,2),(25,5,2),(37,7,2),(21,4,2),(19,3,2),(5,1,1);
INSERT INTO t1 values (179,5,2);
update t1 set parent_id=parent_id+100;
select * from t1 where parent_id=102;
id	parent_id	level
8	102	2
9	102	2
15	102	2
update t1 set id=id+1000;
update t1 set id=1024 where id=1009;
select * from t1;
id	parent_id	level
1001	100	0
1003	101	1
1004	101	1
1008	102	2
1024	102	2
1017	103	2
1022	104	2
1024	104	2
1028	105	2
1029	105	2
1030	105	2
1031	106	2
1032	106	2
1033	106	2
1203	107	2
1202	107	2
1020	103	2
1157	100	0
1193	105	2
1040	107	2
1002	101	1
1015	102	2
1006	101	1
1034	106	2
1035	106	2
1016	103	2
1007	101	1
1036	107	2
1018	103	2
1026	105	2
1027	105	2
1183	104	2
1038	107	2
1025	105	2
1037	107	2
1021	104	2
1019	103	2
1005	101	1
1179	105	2
update ignore t1 set id=id+1;
select * from t1;
id	parent_id	level
1002	100	0
1004	101	1
1005	101	1
1009	102	2
1025	102	2
1018	103	2
1023	104	2
1025	104	2
1029	105	2
1030	105	2
1031	105	2
1032	106	2
1033	106	2
1034	106	2
1204	107	2
1203	107	2
1021	103	2
1158	100	0
1194	105	2
1041	107	2
1003	101	1
1016	102	2
1007	101	1
1035	106	2
1036	106	2
1017	103	2
1008	101	1
1037	107	2
1019	103	2
1027	105	2
1028	105	2
1184	104	2
1039	107	2
1026	105	2
1038	107	2
1022	104	2
1020	103	2
1006	101	1
1180	105	2
update ignore t1 set id=1023 where id=1010;
select * from t1 where parent_id=102;
id	parent_id	level
1009	102	2
1025	102	2
1016	102	2
explain select level from t1 where level=1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	level	level	1	const	#	Using index
select level,id from t1 where level=1;
level	id
1	1004
1	1005
1	1003
1	1007
1	1008
1	1006
select level,id,parent_id from t1 where level=1;
level	id	parent_id
1	1004	101
1	1005	101
1	1003	101
1	1007	101
1	1008	101
1	1006	101
select level,id from t1 where level=1 order by id;
level	id
1	1003
1	1004
1	1005
1	1006
1	1007
1	1008
delete from t1 where level=1;
select * from t1;
id	parent_id	level
1002	100	0
1009	102	2
1025	102	2
1018	103	2
1023	104	2
1025	104	2
1029	105	2
1030	105	2
1031	105	2
1032	106	2
1033	106	2
1034	106	2
1204	107	2
1203	107	2
1021	103	2
1158	100	0
1194	105	2
1041	107	2
1016	102	2
1035	106	2
1036	106	2
1017	103	2
1037	107	2
1019	103	2
1027	105	2
1028	105	2
1184	104	2
1039	107	2
1026	105	2
1038	107	2
1022	104	2
1020	103	2
1180	105	2
drop table t1;
CREATE TABLE t1 (
sca_code char(6) NOT NULL,
cat_code char(6) NOT NULL,
sca_desc varchar(50),
lan_code char(2) NOT NULL,
sca_pic varchar(100),
sca_sdesc varchar(50),
sca_sch_desc varchar(16),
PRIMARY KEY (sca_code, cat_code, lan_code),
INDEX sca_pic (sca_pic)
) engine = innodb ;
INSERT INTO t1 ( sca_code, cat_code, sca_desc, lan_code, sca_pic, sca_sdesc, sca_sch_desc) VALUES ( 'PD', 'J', 'PENDANT', 'EN', NULL, NULL, 'PENDANT'),( 'RI', 'J', 'RING', 'EN', NULL, NULL, 'RING'),( 'QQ', 'N', 'RING', 'EN', 'not null', NULL, 'RING');
select count(*) from t1 where sca_code = 'PD';
count(*)
1
select count(*) from t1 where sca_code <= 'PD';
count(*)
1
select count(*) from t1 where sca_pic is null;
count(*)
2
alter table t1 drop index sca_pic, add index sca_pic (cat_code, sca_pic);
select count(*) from t1 where sca_code='PD' and sca_pic is null;
count(*)
1
select count(*) from t1 where cat_code='E';
count(*)
0
alter table t1 drop index sca_pic, add index (sca_pic, cat_code);
select count(*) from t1 where sca_code='PD' and sca_pic is null;
count(*)
1
select count(*) from t1 where sca_pic >= 'n';
count(*)
1
select sca_pic from t1 where sca_pic is null;
sca_pic
NULL
NULL
update t1 set sca_pic="test" where sca_pic is null;
delete from t1 where sca_code='pd';
drop table t1;
set @a:=now();
CREATE TABLE t1 (a int not null, b timestamp not null, primary key (a)) engine=innodb;
insert into t1 (a) values(1),(2),(3);
select t1.a from t1 natural join t1 as t2 where t1.b >= @a order by t1.a;
a
1
2
3
select a from t1 natural join t1 as t2 where b >= @a order by a;
a
1
2
3
update t1 set a=5 where a=1;
select a from t1;
a
2
3
5
drop table t1;
create table t1 (a varchar(100) not null, primary key(a), b int not null) engine=innodb;
insert into t1 values("hello",1),("world",2);
select * from t1 order by b desc;
a	b
world	2
hello	1
optimize table t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	note	Table does not support optimize, doing recreate + analyze instead
test.t1	optimize	status	OK
show keys from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_Comment
t1	0	PRIMARY	1	a	A	#	NULL	NULL		BTREE		
drop table t1;
create table t1 (i int, j int ) ENGINE=innodb;
insert into t1 values (1,2);
select * from t1 where i=1 and j=2;
i	j
1	2
create index ax1 on t1 (i,j);
select * from t1 where i=1 and j=2;
i	j
1	2
drop table t1;
CREATE TABLE t1 (
a int3 unsigned NOT NULL,
b int1 unsigned NOT NULL,
UNIQUE (a, b)
) ENGINE = innodb;
INSERT INTO t1 VALUES (1, 1);
SELECT MIN(B),MAX(b) FROM t1 WHERE t1.a = 1;
MIN(B)	MAX(b)
1	1
drop table t1;
CREATE TABLE t1 (a int unsigned NOT NULL) engine=innodb;
INSERT INTO t1 VALUES (1);
SELECT * FROM t1;
a
1
DROP TABLE t1;
create table t1 (a int  primary key,b int, c int, d int, e int, f int, g int, h int, i int, j int, k int, l int, m int, n int, o int, p int, q int, r int, s int, t int, u int, v int, w int, x int, y int, z int, a1 int, a2 int, a3 int, a4 int, a5 int, a6 int, a7 int, a8 int, a9 int, b1 int, b2 int, b3 int, b4 int, b5 int, b6 int) engine = innodb;
insert into t1 values (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1);
explain select * from t1 where a > 0 and a < 50;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	#	Using where
drop table t1;
create table t1 (id int NOT NULL,id2 int NOT NULL,id3 int NOT NULL,dummy1 char(30),primary key (id,id2),index index_id3 (id3)) engine=innodb;
insert into t1 values (0,0,0,'ABCDEFGHIJ'),(2,2,2,'BCDEFGHIJK'),(1,1,1,'CDEFGHIJKL');
LOCK TABLES t1 WRITE;
insert into t1 values (99,1,2,'D'),(1,1,2,'D');
ERROR 23000: Duplicate entry '1-1' for key 'PRIMARY'
select id from t1;
id
0
1
2
select id from t1;
id
0
1
2
UNLOCK TABLES;
DROP TABLE t1;
create table t1 (id int NOT NULL,id2 int NOT NULL,id3 int NOT NULL,dummy1 char(30),primary key (id,id2),index index_id3 (id3)) engine=innodb;
insert into t1 values (0,0,0,'ABCDEFGHIJ'),(2,2,2,'BCDEFGHIJK'),(1,1,1,'CDEFGHIJKL');
LOCK TABLES t1 WRITE;
begin;
insert into t1 values (99,1,2,'D'),(1,1,2,'D');
ERROR 23000: Duplicate entry '1-1' for key 'PRIMARY'
select id from t1;
id
0
1
2
insert ignore into t1 values (100,1,2,'D'),(1,1,99,'D');
commit;
select id,id3 from t1;
id	id3
0	0
1	1
2	2
100	2
UNLOCK TABLES;
DROP TABLE t1;
create table t1 (a char(20), unique (a(5))) engine=innodb;
drop table t1;
create table t1 (a char(20), index (a(5))) engine=innodb;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` char(20) DEFAULT NULL,
  KEY `a` (`a`(5))
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t1;
create temporary table t1 (a int not null auto_increment, primary key(a)) engine=innodb;
insert into t1 values (NULL),(NULL),(NULL);
delete from t1 where a=3;
insert into t1 values (NULL);
select * from t1;
a
1
2
4
alter table t1 add b int;
select * from t1;
a	b
1	NULL
2	NULL
4	NULL
drop table t1;
create table t1
(
id int auto_increment primary key,
name varchar(32) not null,
value text not null,
uid int not null,
unique key(name,uid)
) engine=innodb;
insert into t1 values (1,'one','one value',101),
(2,'two','two value',102),(3,'three','three value',103);
set insert_id=5;
replace into t1 (value,name,uid) values ('other value','two',102);
delete from t1 where uid=102;
set insert_id=5;
replace into t1 (value,name,uid) values ('other value','two',102);
set insert_id=6;
replace into t1 (value,name,uid) values ('other value','two',102);
select * from t1;
id	name	value	uid
1	one	one value	101
3	three	three value	103
6	two	other value	102
drop table t1;
create database mysqltest;
create table mysqltest.t1 (a int not null) engine= innodb;
insert into mysqltest.t1 values(1);
create table mysqltest.t2 (a int not null) engine= myisam;
insert into mysqltest.t2 values(1);
create table mysqltest.t3 (a int not null) engine= heap;
insert into mysqltest.t3 values(1);
commit;
drop database mysqltest;
show tables from mysqltest;
ERROR 42000: Unknown database 'mysqltest'
set autocommit=0;
create table t1 (a int not null) engine= innodb;
insert into t1 values(1),(2);
truncate table t1;
commit;
truncate table t1;
truncate table t1;
select * from t1;
a
insert into t1 values(1),(2);
delete from t1;
select * from t1;
a
commit;
drop table t1;
set autocommit=1;
create table t1 (a int not null) engine= innodb;
insert into t1 values(1),(2);
truncate table t1;
insert into t1 values(1),(2);
select * from t1;
a
1
2
truncate table t1;
insert into t1 values(1),(2);
delete from t1;
select * from t1;
a
drop table t1;
create table t1 (a int not null, b int not null, c int not null, primary key (a),key(b)) engine=innodb;
insert into t1 values (3,3,3),(1,1,1),(2,2,2),(4,4,4);
explain select * from t1 order by a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	PRIMARY	4	NULL	#	
explain select * from t1 order by b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	#	Using filesort
explain select * from t1 order by c;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	#	Using filesort
explain select a from t1 order by a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	PRIMARY	4	NULL	#	Using index
explain select b from t1 order by b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	b	4	NULL	#	Using index
explain select a,b from t1 order by b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	b	4	NULL	#	Using index
explain select a,b from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	b	4	NULL	#	Using index
explain select a,b,c from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	#	
drop table t1;
create table t1 (t int not null default 1, key (t)) engine=innodb;
desc t1;
Field	Type	Null	Key	Default	Extra
t	int(11)	NO	MUL	1	
drop table t1;
CREATE TABLE t1 (
number bigint(20) NOT NULL default '0',
cname char(15) NOT NULL default '',
carrier_id smallint(6) NOT NULL default '0',
privacy tinyint(4) NOT NULL default '0',
last_mod_date timestamp NOT NULL,
last_mod_id smallint(6) NOT NULL default '0',
last_app_date timestamp NOT NULL,
last_app_id smallint(6) default '-1',
version smallint(6) NOT NULL default '0',
assigned_scps int(11) default '0',
status tinyint(4) default '0'
) ENGINE=InnoDB;
INSERT INTO t1 VALUES (4077711111,'SeanWheeler',90,2,20020111112846,500,00000000000000,-1,2,3,1);
INSERT INTO t1 VALUES (9197722223,'berry',90,3,20020111112809,500,20020102114532,501,4,10,0);
INSERT INTO t1 VALUES (650,'San Francisco',0,0,20011227111336,342,00000000000000,-1,1,24,1);
INSERT INTO t1 VALUES (302467,'Sue\'s Subshop',90,3,20020109113241,500,20020102115111,501,7,24,0);
INSERT INTO t1 VALUES (6014911113,'SudzCarwash',520,1,20020102115234,500,20020102115259,501,33,32768,0);
INSERT INTO t1 VALUES (333,'tubs',99,2,20020109113440,501,20020109113440,500,3,10,0);
CREATE TABLE t2 (
number bigint(20) NOT NULL default '0',
cname char(15) NOT NULL default '',
carrier_id smallint(6) NOT NULL default '0',
privacy tinyint(4) NOT NULL default '0',
last_mod_date timestamp NOT NULL,
last_mod_id smallint(6) NOT NULL default '0',
last_app_date timestamp NOT NULL,
last_app_id smallint(6) default '-1',
version smallint(6) NOT NULL default '0',
assigned_scps int(11) default '0',
status tinyint(4) default '0'
) ENGINE=InnoDB;
INSERT INTO t2 VALUES (4077711111,'SeanWheeler',0,2,20020111112853,500,00000000000000,-1,2,3,1);
INSERT INTO t2 VALUES (9197722223,'berry',90,3,20020111112818,500,20020102114532,501,4,10,0);
INSERT INTO t2 VALUES (650,'San Francisco',90,0,20020109113158,342,00000000000000,-1,1,24,1);
INSERT INTO t2 VALUES (333,'tubs',99,2,20020109113453,501,20020109113453,500,3,10,0);
select * from t1;
number	cname	carrier_id	privacy	last_mod_date	last_mod_id	last_app_date	last_app_id	version	assigned_scps	status
4077711111	SeanWheeler	90	2	2002-01-11 11:28:46	500	0000-00-00 00:00:00	-1	2	3	1
9197722223	berry	90	3	2002-01-11 11:28:09	500	2002-01-02 11:45:32	501	4	10	0
650	San Francisco	0	0	2001-12-27 11:13:36	342	0000-00-00 00:00:00	-1	1	24	1
302467	Sue's Subshop	90	3	2002-01-09 11:32:41	500	2002-01-02 11:51:11	501	7	24	0
6014911113	SudzCarwash	520	1	2002-01-02 11:52:34	500	2002-01-02 11:52:59	501	33	32768	0
333	tubs	99	2	2002-01-09 11:34:40	501	2002-01-09 11:34:40	500	3	10	0
select * from t2;
number	cname	carrier_id	privacy	last_mod_date	last_mod_id	last_app_date	last_app_id	version	assigned_scps	status
4077711111	SeanWheeler	0	2	2002-01-11 11:28:53	500	0000-00-00 00:00:00	-1	2	3	1
9197722223	berry	90	3	2002-01-11 11:28:18	500	2002-01-02 11:45:32	501	4	10	0
650	San Francisco	90	0	2002-01-09 11:31:58	342	0000-00-00 00:00:00	-1	1	24	1
333	tubs	99	2	2002-01-09 11:34:53	501	2002-01-09 11:34:53	500	3	10	0
delete t1, t2 from t1 left join t2 on t1.number=t2.number where (t1.carrier_id=90 and t1.number=t2.number) or (t2.carrier_id=90 and t1.number=t2.number) or  (t1.carrier_id=90 and t2.number is null);
select * from t1;
number	cname	carrier_id	privacy	last_mod_date	last_mod_id	last_app_date	last_app_id	version	assigned_scps	status
6014911113	SudzCarwash	520	1	2002-01-02 11:52:34	500	2002-01-02 11:52:59	501	33	32768	0
333	tubs	99	2	2002-01-09 11:34:40	501	2002-01-09 11:34:40	500	3	10	0
select * from t2;
number	cname	carrier_id	privacy	last_mod_date	last_mod_id	last_app_date	last_app_id	version	assigned_scps	status
333	tubs	99	2	2002-01-09 11:34:53	501	2002-01-09 11:34:53	500	3	10	0
select * from t2;
number	cname	carrier_id	privacy	last_mod_date	last_mod_id	last_app_date	last_app_id	version	assigned_scps	status
333	tubs	99	2	2002-01-09 11:34:53	501	2002-01-09 11:34:53	500	3	10	0
drop table t1,t2;
create table t1 (id int unsigned not null auto_increment, code tinyint unsigned not null, name char(20) not null, primary key (id), key (code), unique (name)) engine=innodb;
BEGIN;
SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SELECT @@tx_isolation,@@global.tx_isolation;
@@tx_isolation	@@global.tx_isolation
SERIALIZABLE	REPEATABLE-READ
insert into t1 (code, name) values (1, 'Tim'), (1, 'Monty'), (2, 'David');
select id, code, name from t1 order by id;
id	code	name
1	1	Tim
2	1	Monty
3	2	David
COMMIT;
BEGIN;
SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
insert into t1 (code, name) values (2, 'Erik'), (3, 'Sasha');
select id, code, name from t1 order by id;
id	code	name
1	1	Tim
2	1	Monty
3	2	David
4	2	Erik
5	3	Sasha
COMMIT;
SET binlog_format='MIXED';
BEGIN;
SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
insert into t1 (code, name) values (3, 'Jeremy'), (4, 'Matt');
select id, code, name from t1 order by id;
id	code	name
1	1	Tim
2	1	Monty
3	2	David
4	2	Erik
5	3	Sasha
6	3	Jeremy
7	4	Matt
COMMIT;
DROP TABLE t1;
create table t1 (n int(10), d int(10)) engine=innodb;
create table t2 (n int(10), d int(10)) engine=innodb;
insert into t1 values(1,1),(1,2);
insert into t2 values(1,10),(2,20);
UPDATE t1,t2 SET t1.d=t2.d,t2.d=30 WHERE t1.n=t2.n;
select * from t1;
n	d
1	10
1	10
select * from t2;
n	d
1	30
2	20
drop table t1,t2;
drop table if exists t1, t2;
CREATE TABLE t1 (a int, PRIMARY KEY (a));
CREATE TABLE t2 (a int, PRIMARY KEY (a)) ENGINE=InnoDB;
create trigger trg_del_t2 after  delete on t2 for each row
insert into t1 values (1);
insert into t1 values (1);
insert into t2 values (1),(2);
delete t2 from t2;
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
select count(*) from t2 /* must be 2 as restored after rollback caused by the error */;
count(*)
2
drop table t1, t2;
create table t1 (a int, b int) engine=innodb;
insert into t1 values(20,null);
select t2.b, ifnull(t2.b,"this is null") from t1 as t2 left join t1 as t3 on
t2.b=t3.a;
b	ifnull(t2.b,"this is null")
NULL	this is null
select t2.b, ifnull(t2.b,"this is null") from t1 as t2 left join t1 as t3 on
t2.b=t3.a order by 1;
b	ifnull(t2.b,"this is null")
NULL	this is null
insert into t1 values(10,null);
select t2.b, ifnull(t2.b,"this is null") from t1 as t2 left join t1 as t3 on
t2.b=t3.a order by 1;
b	ifnull(t2.b,"this is null")
NULL	this is null
NULL	this is null
drop table t1;
create table t1 (a varchar(10) not null) engine=myisam;
create table t2 (b varchar(10) not null unique) engine=innodb;
select t1.a from t1,t2 where t1.a=t2.b;
a
drop table t1,t2;
create table t1 (a int not null, b int, primary key (a)) engine = innodb;
create table t2 (a int not null, b int, primary key (a)) engine = innodb;
insert into t1 values (10, 20);
insert into t2 values (10, 20);
update t1, t2 set t1.b = 150, t2.b = t1.b where t2.a = t1.a and t1.a = 10;
drop table t1,t2;
CREATE TABLE t1 (id INT NOT NULL, PRIMARY KEY (id)) ENGINE=INNODB;
CREATE TABLE t2 (id INT PRIMARY KEY, t1_id INT, INDEX par_ind (t1_id), FOREIGN KEY (t1_id) REFERENCES t1(id)  ON DELETE CASCADE ) ENGINE=INNODB;
insert into t1 set id=1;
insert into t2 set id=1, t1_id=1;
delete t1,t2 from t1,t2 where t1.id=t2.t1_id;
select * from t1;
id
select * from t2;
id	t1_id
drop table t2,t1;
CREATE TABLE t1(id INT NOT NULL,  PRIMARY KEY (id)) ENGINE=INNODB;
CREATE TABLE t2(id  INT PRIMARY KEY, t1_id INT, INDEX par_ind (t1_id)  ) ENGINE=INNODB;
INSERT INTO t1 VALUES(1);
INSERT INTO t2 VALUES(1, 1);
SELECT * from t1;
id
1
UPDATE t1,t2 SET t1.id=t1.id+1, t2.t1_id=t1.id+1;
SELECT * from t1;
id
2
UPDATE t1,t2 SET t1.id=t1.id+1 where t1.id!=t2.id;
SELECT * from t1;
id
3
DROP TABLE t1,t2;
set autocommit=0;
CREATE TABLE t1 (id CHAR(15) NOT NULL, value CHAR(40) NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB;
CREATE TABLE t2 (id CHAR(15) NOT NULL, value CHAR(40) NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB;
CREATE TABLE t3 (id1 CHAR(15) NOT NULL, id2 CHAR(15) NOT NULL, PRIMARY KEY(id1, id2)) ENGINE=InnoDB;
INSERT INTO t3 VALUES("my-test-1", "my-test-2");
COMMIT;
INSERT INTO t1 VALUES("this-key", "will disappear");
INSERT INTO t2 VALUES("this-key", "will also disappear");
DELETE FROM t3 WHERE id1="my-test-1";
SELECT * FROM t1;
id	value
this-key	will disappear
SELECT * FROM t2;
id	value
this-key	will also disappear
SELECT * FROM t3;
id1	id2
ROLLBACK;
SELECT * FROM t1;
id	value
SELECT * FROM t2;
id	value
SELECT * FROM t3;
id1	id2
my-test-1	my-test-2
SELECT * FROM t3 WHERE id1="my-test-1" LOCK IN SHARE MODE;
id1	id2
my-test-1	my-test-2
COMMIT;
set autocommit=1;
DROP TABLE t1,t2,t3;
CREATE TABLE t1 (a int not null primary key, b int not null, unique (b)) engine=innodb;
INSERT INTO t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
UPDATE t1 set a=a+100 where b between 2 and 3 and a < 1000;
SELECT * from t1;
a	b
1	1
102	2
103	3
4	4
5	5
6	6
7	7
8	8
9	9
drop table t1;
CREATE TABLE t1 (a int not null primary key, b int not null, key (b)) engine=innodb;
CREATE TABLE t2 (a int not null primary key, b int not null, key (b)) engine=innodb;
INSERT INTO t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9),(10,10),(11,11),(12,12);
INSERT INTO t2 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
update t1,t2 set t1.a=t1.a+100;
select * from t1;
a	b
101	1
102	2
103	3
104	4
105	5
106	6
107	7
108	8
109	9
110	10
111	11
112	12
update t1,t2 set t1.a=t1.a+100 where t1.a=101;
select * from t1;
a	b
201	1
102	2
103	3
104	4
105	5
106	6
107	7
108	8
109	9
110	10
111	11
112	12
update t1,t2 set t1.b=t1.b+10 where t1.b=2;
select * from t1;
a	b
201	1
103	3
104	4
105	5
106	6
107	7
108	8
109	9
110	10
111	11
102	12
112	12
update t1,t2 set t1.b=t1.b+2,t2.b=t1.b+10 where t1.b between 3 and 5 and t1.a=t2.a+100;
select * from t1;
a	b
201	1
103	5
104	6
106	6
105	7
107	7
108	8
109	9
110	10
111	11
102	12
112	12
select * from t2;
a	b
1	1
2	2
6	6
7	7
8	8
9	9
3	13
4	14
5	15
drop table t1,t2;
CREATE TABLE t2 (   NEXT_T         BIGINT NOT NULL PRIMARY KEY) ENGINE=MyISAM;
CREATE TABLE t1 (  B_ID           INTEGER NOT NULL PRIMARY KEY) ENGINE=InnoDB;
SET AUTOCOMMIT=0;
INSERT INTO t1 ( B_ID ) VALUES ( 1 );
INSERT INTO t2 ( NEXT_T ) VALUES ( 1 );
ROLLBACK;
Warnings:
Warning	1196	Some non-transactional changed tables couldn't be rolled back
SELECT * FROM t1;
B_ID
drop table  t1,t2;
create table t1  ( pk         int primary key,    parent     int not null,    child      int not null,       index (parent)  ) engine = innodb;
insert into t1 values   (1,0,4),  (2,1,3),  (3,2,1),  (4,1,2);
select distinct  parent,child   from t1   order by parent;
parent	child
0	4
1	2
1	3
2	1
drop table t1;
create table t1 (a int not null auto_increment primary key, b int, c int, key(c)) engine=innodb;
create table t2 (a int not null auto_increment primary key, b int);
insert into t1 (b) values (null),(null),(null),(null),(null),(null),(null);
insert into t2 (a) select b from t1;
insert into t1 (b) select b from t2;
insert into t2 (a) select b from t1;
insert into t1 (a) select b from t2;
insert into t2 (a) select b from t1;
insert into t1 (a) select b from t2;
insert into t2 (a) select b from t1;
insert into t1 (a) select b from t2;
insert into t2 (a) select b from t1;
insert into t1 (a) select b from t2;
select count(*) from t1;
count(*)
623
explain select * from t1 where c between 1 and 2500;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	c	c	5	NULL	#	Using index condition; Using MRR
update t1 set c=a;
explain select * from t1 where c between 1 and 2500;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	c	NULL	NULL	NULL	#	Using where
drop table t1,t2;
create table t1 (id int primary key auto_increment, fk int, index index_fk (fk)) engine=innodb;
insert into t1 (id) values (null),(null),(null),(null),(null);
update t1 set fk=69 where fk is null order by id limit 1;
SELECT * from t1;
id	fk
2	NULL
3	NULL
4	NULL
5	NULL
1	69
drop table t1;
create table t1 (a int not null, b int not null, key (a));
insert into t1 values (1,1),(1,2),(1,3),(3,1),(3,2),(3,3),(3,1),(3,2),(3,3),(2,1),(2,2),(2,3);
SET @tmp=0;
update t1 set b=(@tmp:=@tmp+1) order by a;
update t1 set b=99 where a=1 order by b asc limit 1;
update t1 set b=100 where a=1 order by b desc limit 2;
update t1 set a=a+10+b where a=1 order by b;
select * from t1 order by a,b;
a	b
2	4
2	5
2	6
3	7
3	8
3	9
3	10
3	11
3	12
13	2
111	100
111	100
drop table t1;
create table t1 ( c char(8) not null ) engine=innodb;
insert into t1 values ('0'),('1'),('2'),('3'),('4'),('5'),('6'),('7'),('8'),('9');
insert into t1 values ('A'),('B'),('C'),('D'),('E'),('F');
alter table t1 add b char(8) not null;
alter table t1 add a char(8) not null;
alter table t1 add primary key (a,b,c);
update t1 set a=c, b=c;
create table t2 (c char(8) not null, b char(8) not null, a char(8) not null, primary key(a,b,c)) engine=innodb;
insert into t2 select * from t1;
delete t1,t2 from t2,t1 where t1.a<'B' and t2.b=t1.b;
drop table t1,t2;
SET AUTOCOMMIT=1;
create table t1 (a integer auto_increment primary key) engine=innodb;
insert into t1 (a) values (NULL),(NULL);
truncate table t1;
insert into t1 (a) values (NULL),(NULL);
SELECT * from t1;
a
1
2
drop table t1;
CREATE TABLE t1 (`id 1` INT NOT NULL, PRIMARY KEY (`id 1`)) ENGINE=INNODB;
CREATE TABLE t2 (id INT PRIMARY KEY, t1_id INT, INDEX par_ind (t1_id), FOREIGN KEY (`t1_id`) REFERENCES `t1`(`id 1`)  ON DELETE CASCADE ) ENGINE=INNODB;
drop table t2,t1;
create table `t1` (`id` int( 11 ) not null  ,primary key ( `id` )) engine = innodb;
insert into `t1`values ( 1 ) ;
create table `t2` (`id` int( 11 ) not null default '0',unique key `id` ( `id` ) ,constraint `t1_id_fk` foreign key ( `id` ) references `t1` (`id` )) engine = innodb;
insert into `t2`values ( 1 ) ;
create table `t3` (`id` int( 11 ) not null default '0',key `id` ( `id` ) ,constraint `t2_id_fk` foreign key ( `id` ) references `t2` (`id` )) engine = innodb;
insert into `t3`values ( 1 ) ;
delete t3,t2,t1 from t1,t2,t3 where t1.id =1 and t2.id = t1.id and t3.id = t2.id;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`))
update t1,t2,t3 set t3.id=5, t2.id=6, t1.id=7  where t1.id =1 and t2.id = t1.id and t3.id = t2.id;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`))
update t3 set  t3.id=7  where t1.id =1 and t2.id = t1.id and t3.id = t2.id;
ERROR 42S22: Unknown column 't1.id' in 'where clause'
drop table t3,t2,t1;
create table t1(
id int primary key,
pid int,
index(pid),
foreign key(pid) references t1(id) on delete cascade) engine=innodb;
insert into t1 values(0,0),(1,0),(2,1),(3,2),(4,3),(5,4),(6,5),(7,6),
(8,7),(9,8),(10,9),(11,10),(12,11),(13,12),(14,13),(15,14);
delete from t1 where id=0;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t1`, CONSTRAINT `t1_ibfk_1` FOREIGN KEY (`pid`) REFERENCES `t1` (`id`) ON DELETE CASCADE)
delete from t1 where id=15;
delete from t1 where id=0;
drop table t1;
CREATE TABLE t1 (col1 int(1))ENGINE=InnoDB;
CREATE TABLE t2 (col1 int(1),stamp TIMESTAMP,INDEX stamp_idx
(stamp))ENGINE=InnoDB;
insert into t1 values (1),(2),(3);
insert into t2 values (1, 20020204130000),(2, 20020204130000),(4,20020204310000 ),(5,20020204230000);
Warnings:
Warning	1265	Data truncated for column 'stamp' at row 3
SELECT col1 FROM t1 UNION SELECT col1 FROM t2 WHERE stamp <
'20020204120000' GROUP BY col1;
col1
1
2
3
4
drop table t1,t2;
CREATE TABLE t1 (
`id` int(10) unsigned NOT NULL auto_increment,
`id_object` int(10) unsigned default '0',
`id_version` int(10) unsigned NOT NULL default '1',
`label` varchar(100) NOT NULL default '',
`description` text,
PRIMARY KEY  (`id`),
KEY `id_object` (`id_object`),
KEY `id_version` (`id_version`)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES("6", "3382", "9", "Test", NULL), ("7", "102", "5", "Le Pekin (Test)", NULL),("584", "1794", "4", "Test de resto", NULL),("837", "1822", "6", "Test 3", NULL),("1119", "3524", "1", "Societe Test", NULL),("1122", "3525", "1", "Fournisseur Test", NULL);
CREATE TABLE t2 (
`id` int(10) unsigned NOT NULL auto_increment,
`id_version` int(10) unsigned NOT NULL default '1',
PRIMARY KEY  (`id`),
KEY `id_version` (`id_version`)
) ENGINE=InnoDB;
INSERT INTO t2 VALUES("3524", "1"),("3525", "1"),("1794", "4"),("102", "5"),("1822", "6"),("3382", "9");
SELECT t2.id, t1.`label` FROM t2 INNER JOIN
(SELECT t1.id_object as id_object FROM t1 WHERE t1.`label` LIKE '%test%') AS lbl 
ON (t2.id = lbl.id_object) INNER JOIN t1 ON (t2.id = t1.id_object);
id	label
3382	Test
102	Le Pekin (Test)
1794	Test de resto
1822	Test 3
3524	Societe Test
3525	Fournisseur Test
drop table t1,t2;
create table t1 (a int, b varchar(200), c text not null) checksum=1 engine=myisam;
create table t2 (a int, b varchar(200), c text not null) checksum=0 engine=innodb;
create table t3 (a int, b varchar(200), c text not null) checksum=1 engine=innodb;
insert t1 values (1, "aaa", "bbb"), (NULL, "", "ccccc"), (0, NULL, "");
insert t2 select * from t1;
insert t3 select * from t1;
checksum table t1, t2, t3, t4 quick;
Table	Checksum
test.t1	3442722830
test.t2	NULL
test.t3	NULL
test.t4	NULL
Warnings:
Error	1146	Table 'test.t4' doesn't exist
checksum table t1, t2, t3, t4;
Table	Checksum
test.t1	3442722830
test.t2	3442722830
test.t3	3442722830
test.t4	NULL
Warnings:
Error	1146	Table 'test.t4' doesn't exist
checksum table t1, t2, t3, t4 extended;
Table	Checksum
test.t1	3442722830
test.t2	3442722830
test.t3	3442722830
test.t4	NULL
Warnings:
Error	1146	Table 'test.t4' doesn't exist
drop table t1,t2,t3;
create table t1 (id int,  name char(10) not null,  name2 char(10) not null) engine=innodb;
insert into t1 values(1,'first','fff'),(2,'second','sss'),(3,'third','ttt');
select trim(name2) from t1  union all  select trim(name) from t1 union all select trim(id) from t1;
trim(name2)
fff
sss
ttt
first
second
third
1
2
3
drop table t1;
create table t1 (a int) engine=innodb;
create table t2 like t1;
drop table t1,t2;
create table t1 (id int(11) not null, id2 int(11) not null, unique (id,id2)) engine=innodb;
create table t2 (id int(11) not null, constraint t1_id_fk foreign key ( id ) references t1 (id)) engine = innodb;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id` int(11) NOT NULL,
  `id2` int(11) NOT NULL,
  UNIQUE KEY `id` (`id`,`id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL,
  KEY `t1_id_fk` (`id`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
create index id on t2 (id);
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL,
  KEY `id` (`id`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
create index id2 on t2 (id);
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL,
  KEY `id` (`id`),
  KEY `id2` (`id`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop index id2 on t2;
drop index id on t2;
Got one of the listed errors
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL,
  KEY `id` (`id`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t2;
create table t2 (id int(11) not null, id2 int(11) not null, constraint t1_id_fk foreign key (id,id2) references t1 (id,id2)) engine = innodb;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL,
  `id2` int(11) NOT NULL,
  KEY `t1_id_fk` (`id`,`id2`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`, `id2`) REFERENCES `t1` (`id`, `id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
create unique index id on t2 (id,id2);
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL,
  `id2` int(11) NOT NULL,
  UNIQUE KEY `id` (`id`,`id2`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`, `id2`) REFERENCES `t1` (`id`, `id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t2;
create table t2 (id int(11) not null, id2 int(11) not null, unique (id,id2),constraint t1_id_fk foreign key (id2,id) references t1 (id,id2)) engine = innodb;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL,
  `id2` int(11) NOT NULL,
  UNIQUE KEY `id` (`id`,`id2`),
  KEY `t1_id_fk` (`id2`,`id`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id2`, `id`) REFERENCES `t1` (`id`, `id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t2;
create table t2 (id int(11) not null, id2 int(11) not null, unique (id,id2), constraint t1_id_fk foreign key (id) references t1 (id)) engine = innodb;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL,
  `id2` int(11) NOT NULL,
  UNIQUE KEY `id` (`id`,`id2`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t2;
create table t2 (id int(11) not null, id2 int(11) not null, unique (id,id2),constraint t1_id_fk foreign key (id2,id) references t1 (id,id2)) engine = innodb;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL,
  `id2` int(11) NOT NULL,
  UNIQUE KEY `id` (`id`,`id2`),
  KEY `t1_id_fk` (`id2`,`id`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id2`, `id`) REFERENCES `t1` (`id`, `id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t2;
create table t2 (id int(11) not null auto_increment, id2 int(11) not null, constraint t1_id_fk foreign key (id) references t1 (id), primary key (id), index (id,id2)) engine = innodb;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `id2` int(11) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `id` (`id`,`id2`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t2;
create table t2 (id int(11) not null auto_increment, id2 int(11) not null, constraint t1_id_fk foreign key (id) references t1 (id)) engine= innodb;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `id2` int(11) NOT NULL,
  KEY `t1_id_fk` (`id`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
alter table t2 add index id_test (id), add index id_test2 (id,id2);
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `id2` int(11) NOT NULL,
  KEY `id_test` (`id`),
  KEY `id_test2` (`id`,`id2`),
  CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t2;
create table t2 (id int(11) not null, id2 int(11) not null, constraint t1_id_fk foreign key (id2,id) references t1 (id)) engine = innodb;
ERROR 42000: Incorrect foreign key definition for 't1_id_fk': Key reference and table reference don't match
create table t2 (a int auto_increment primary key, b int, index(b), foreign key (b) references t1(id), unique(b)) engine=innodb;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `a` int(11) NOT NULL AUTO_INCREMENT,
  `b` int(11) DEFAULT NULL,
  PRIMARY KEY (`a`),
  UNIQUE KEY `b_2` (`b`),
  KEY `b` (`b`),
  CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`b`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t2;
create table t2 (a int auto_increment primary key, b int, foreign key (b) references t1(id), foreign key (b) references t1(id), unique(b)) engine=innodb;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `a` int(11) NOT NULL AUTO_INCREMENT,
  `b` int(11) DEFAULT NULL,
  PRIMARY KEY (`a`),
  UNIQUE KEY `b` (`b`),
  CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`b`) REFERENCES `t1` (`id`),
  CONSTRAINT `t2_ibfk_2` FOREIGN KEY (`b`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t2, t1;
create table t1 (c char(10), index (c,c)) engine=innodb;
ERROR 42S21: Duplicate column name 'c'
create table t1 (c1 char(10), c2 char(10), index (c1,c2,c1)) engine=innodb;
ERROR 42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10), index (c1,c1,c2)) engine=innodb;
ERROR 42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10), index (c2,c1,c1)) engine=innodb;
ERROR 42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10)) engine=innodb;
alter table t1 add key (c1,c1);
ERROR 42S21: Duplicate column name 'c1'
alter table t1 add key (c2,c1,c1);
ERROR 42S21: Duplicate column name 'c1'
alter table t1 add key (c1,c2,c1);
ERROR 42S21: Duplicate column name 'c1'
alter table t1 add key (c1,c1,c2);
ERROR 42S21: Duplicate column name 'c1'
drop table t1;
create table t1(a int(1) , b int(1)) engine=innodb;
insert into t1 values ('1111', '3333');
select distinct concat(a, b) from t1;
concat(a, b)
11113333
drop table t1;
CREATE TABLE t1 ( a char(10) ) ENGINE=InnoDB;
SELECT a FROM t1 WHERE MATCH (a) AGAINST ('test' IN BOOLEAN MODE);
ERROR HY000: The used table type doesn't support FULLTEXT indexes
DROP TABLE t1;
CREATE TABLE t1 (a_id tinyint(4) NOT NULL default '0', PRIMARY KEY  (a_id)) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES (1),(2),(3);
CREATE TABLE t2 (b_id tinyint(4) NOT NULL default '0',b_a tinyint(4) NOT NULL default '0', PRIMARY KEY  (b_id), KEY  (b_a), 
CONSTRAINT fk_b_a FOREIGN KEY (b_a) REFERENCES t1 (a_id) ON DELETE CASCADE ON UPDATE NO ACTION) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t2 VALUES (1,1),(2,1),(3,1),(4,2),(5,2);
SELECT * FROM (SELECT t1.*,GROUP_CONCAT(t2.b_id SEPARATOR ',') as b_list FROM (t1 LEFT JOIN (t2) on t1.a_id = t2.b_a) GROUP BY t1.a_id ) AS xyz;
a_id	b_list
1	1,2,3
2	4,5
3	NULL
DROP TABLE t2;
DROP TABLE t1;
create temporary table t1 (a int) engine=innodb;
insert into t1 values (4711);
truncate t1;
insert into t1 values (42);
select * from t1;
a
42
drop table t1;
create table t1 (a int) engine=innodb;
insert into t1 values (4711);
truncate t1;
insert into t1 values (42);
select * from t1;
a
42
drop table t1;
create table t1 (a int not null, b int not null, c blob not null, d int not null, e int, primary key (a,b,c(255),d)) engine=innodb;
insert into t1 values (2,2,"b",2,2),(1,1,"a",1,1),(3,3,"ab",3,3);
select * from t1 order by a,b,c,d;
a	b	c	d	e
1	1	a	1	1
2	2	b	2	2
3	3	ab	3	3
explain select * from t1 order by a,b,c,d;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using filesort
drop table t1;
create table t1 (a char(1), b char(1), key(a, b)) engine=innodb;
insert into t1 values ('8', '6'), ('4', '7');
select min(a) from t1;
min(a)
4
select min(b) from t1 where a='8';
min(b)
6
drop table t1;
create table t1 (x bigint unsigned not null primary key) engine=innodb;
insert into t1(x) values (0xfffffffffffffff0),(0xfffffffffffffff1);
select * from t1;
x
18446744073709551600
18446744073709551601
select count(*) from t1 where x>0;
count(*)
2
select count(*) from t1 where x=0;
count(*)
0
select count(*) from t1 where x<0;
count(*)
0
select count(*) from t1 where x < -16;
count(*)
0
select count(*) from t1 where x = -16;
count(*)
0
explain select count(*) from t1 where x > -16;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	PRIMARY	PRIMARY	8	NULL	2	Using where; Using index
select count(*) from t1 where x > -16;
count(*)
2
select * from t1 where x > -16;
x
18446744073709551600
18446744073709551601
select count(*) from t1 where x = 18446744073709551601;
count(*)
1
drop table t1;
show status like "Innodb_buffer_pool_pages_total";
Variable_name	Value
Innodb_buffer_pool_pages_total	512
show status like "Innodb_page_size";
Variable_name	Value
Innodb_page_size	16384
show status like "Innodb_rows_deleted";
Variable_name	Value
Innodb_rows_deleted	71
show status like "Innodb_rows_inserted";
Variable_name	Value
Innodb_rows_inserted	1084
show status like "Innodb_rows_updated";
Variable_name	Value
Innodb_rows_updated	885
show status like "Innodb_row_lock_waits";
Variable_name	Value
Innodb_row_lock_waits	0
show status like "Innodb_row_lock_current_waits";
Variable_name	Value
Innodb_row_lock_current_waits	0
show status like "Innodb_row_lock_time";
Variable_name	Value
Innodb_row_lock_time	0
show status like "Innodb_row_lock_time_max";
Variable_name	Value
Innodb_row_lock_time_max	0
show status like "Innodb_row_lock_time_avg";
Variable_name	Value
Innodb_row_lock_time_avg	0
show variables like "innodb_sync_spin_loops";
Variable_name	Value
innodb_sync_spin_loops	20
set global innodb_sync_spin_loops=1000;
show variables like "innodb_sync_spin_loops";
Variable_name	Value
innodb_sync_spin_loops	1000
set global innodb_sync_spin_loops=0;
show variables like "innodb_sync_spin_loops";
Variable_name	Value
innodb_sync_spin_loops	0
set global innodb_sync_spin_loops=20;
show variables like "innodb_sync_spin_loops";
Variable_name	Value
innodb_sync_spin_loops	20
SET @old_innodb_thread_concurrency= @@global.innodb_thread_concurrency;
show variables like "innodb_thread_concurrency";
Variable_name	Value
innodb_thread_concurrency	8
set global innodb_thread_concurrency=1001;
Warnings:
Warning	1292	Truncated incorrect thread_concurrency value: '1001'
show variables like "innodb_thread_concurrency";
Variable_name	Value
innodb_thread_concurrency	1000
set global innodb_thread_concurrency=0;
show variables like "innodb_thread_concurrency";
Variable_name	Value
innodb_thread_concurrency	0
set global innodb_thread_concurrency=16;
show variables like "innodb_thread_concurrency";
Variable_name	Value
innodb_thread_concurrency	16
SET @@global.innodb_thread_concurrency= @old_innodb_thread_concurrency;
show variables like "innodb_concurrency_tickets";
Variable_name	Value
innodb_concurrency_tickets	500
set global innodb_concurrency_tickets=1000;
show variables like "innodb_concurrency_tickets";
Variable_name	Value
innodb_concurrency_tickets	1000
set global innodb_concurrency_tickets=0;
Warnings:
Warning	1292	Truncated incorrect concurrency_tickets value: '0'
show variables like "innodb_concurrency_tickets";
Variable_name	Value
innodb_concurrency_tickets	1
set global innodb_concurrency_tickets=500;
show variables like "innodb_concurrency_tickets";
Variable_name	Value
innodb_concurrency_tickets	500
show variables like "innodb_thread_sleep_delay";
Variable_name	Value
innodb_thread_sleep_delay	10000
set global innodb_thread_sleep_delay=100000;
show variables like "innodb_thread_sleep_delay";
Variable_name	Value
innodb_thread_sleep_delay	100000
set global innodb_thread_sleep_delay=0;
show variables like "innodb_thread_sleep_delay";
Variable_name	Value
innodb_thread_sleep_delay	0
set global innodb_thread_sleep_delay=10000;
show variables like "innodb_thread_sleep_delay";
Variable_name	Value
innodb_thread_sleep_delay	10000
set storage_engine=INNODB;
drop table if exists t1,t2,t3;
--- Testing varchar ---
--- Testing varchar ---
create table t1 (v varchar(10), c char(10), t text);
insert into t1 values('+ ', '+ ', '+ ');
set @a=repeat(' ',20);
insert into t1 values (concat('+',@a),concat('+',@a),concat('+',@a));
Warnings:
Note	1265	Data truncated for column 'v' at row 1
select concat('*',v,'*',c,'*',t,'*') from t1;
concat('*',v,'*',c,'*',t,'*')
*+ *+*+ *
*+         *+*+                    *
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` varchar(10) DEFAULT NULL,
  `c` char(10) DEFAULT NULL,
  `t` text
) ENGINE=InnoDB DEFAULT CHARSET=latin1
create table t2 like t1;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `v` varchar(10) DEFAULT NULL,
  `c` char(10) DEFAULT NULL,
  `t` text
) ENGINE=InnoDB DEFAULT CHARSET=latin1
create table t3 select * from t1;
show create table t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `v` varchar(10) DEFAULT NULL,
  `c` char(10) DEFAULT NULL,
  `t` text
) ENGINE=InnoDB DEFAULT CHARSET=latin1
alter table t1 modify c varchar(10);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` varchar(10) DEFAULT NULL,
  `c` varchar(10) DEFAULT NULL,
  `t` text
) ENGINE=InnoDB DEFAULT CHARSET=latin1
alter table t1 modify v char(10);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` char(10) DEFAULT NULL,
  `c` varchar(10) DEFAULT NULL,
  `t` text
) ENGINE=InnoDB DEFAULT CHARSET=latin1
alter table t1 modify t varchar(10);
Warnings:
Note	1265	Data truncated for column 't' at row 2
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` char(10) DEFAULT NULL,
  `c` varchar(10) DEFAULT NULL,
  `t` varchar(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
select concat('*',v,'*',c,'*',t,'*') from t1;
concat('*',v,'*',c,'*',t,'*')
*+*+*+ *
*+*+*+         *
drop table t1,t2,t3;
create table t1 (v varchar(10), c char(10), t text, key(v), key(c), key(t(10)));
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` varchar(10) DEFAULT NULL,
  `c` char(10) DEFAULT NULL,
  `t` text,
  KEY `v` (`v`),
  KEY `c` (`c`),
  KEY `t` (`t`(10))
) ENGINE=InnoDB DEFAULT CHARSET=latin1
select count(*) from t1;
count(*)
270
insert into t1 values(concat('a',char(1)),concat('a',char(1)),concat('a',char(1)));
select count(*) from t1 where v='a';
count(*)
10
select count(*) from t1 where c='a';
count(*)
10
select count(*) from t1 where t='a';
count(*)
10
select count(*) from t1 where v='a  ';
count(*)
10
select count(*) from t1 where c='a  ';
count(*)
10
select count(*) from t1 where t='a  ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ' and v between 'a  ' and 'b\n';
count(*)
10
select count(*) from t1 where v like 'a%';
count(*)
11
select count(*) from t1 where c like 'a%';
count(*)
11
select count(*) from t1 where t like 'a%';
count(*)
11
select count(*) from t1 where v like 'a %';
count(*)
9
explain select count(*) from t1 where v='a  ';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	13	const	#	Using where; Using index
explain select count(*) from t1 where c='a  ';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	c	c	11	const	#	Using where; Using index
explain select count(*) from t1 where t='a  ';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	t	t	13	const	#	Using where
explain select count(*) from t1 where v like 'a%';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	v	v	13	NULL	#	Using where; Using index
explain select count(*) from t1 where v between 'a' and 'a ';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	13	const	#	Using where; Using index
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a  ' and 'b\n';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	13	const	#	Using where; Using index
alter table t1 add unique(v);
ERROR 23000: Duplicate entry '{ ' for key 'v_2'
alter table t1 add key(v);
select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a';
qq
*a*a*a*
*a *a*a *
*a  *a*a  *
*a   *a*a   *
*a    *a*a    *
*a     *a*a     *
*a      *a*a      *
*a       *a*a       *
*a        *a*a        *
*a         *a*a         *
explain select * from t1 where v='a';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v,v_2	#	13	const	#	Using index condition
select v,count(*) from t1 group by v limit 10;
v	count(*)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select v,count(t) from t1 group by v limit 10;
v	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select v,count(c) from t1 group by v limit 10;
v	count(c)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select sql_big_result v,count(t) from t1 group by v limit 10;
v	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select sql_big_result v,count(c) from t1 group by v limit 10;
v	count(c)
a	1
a 	10
b     	10
c    	10
d   	10
e  	10
f     	10
g    	10
h	10
i     	10
select c,count(*) from t1 group by c limit 10;
c	count(*)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select c,count(t) from t1 group by c limit 10;
c	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select sql_big_result c,count(t) from t1 group by c limit 10;
c	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select t,count(*) from t1 group by t limit 10;
t	count(*)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select t,count(t) from t1 group by t limit 10;
t	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select sql_big_result t,count(t) from t1 group by t limit 10;
t	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
alter table t1 modify v varchar(300), drop key v, drop key v_2, add key v (v);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` varchar(300) DEFAULT NULL,
  `c` char(10) DEFAULT NULL,
  `t` text,
  KEY `c` (`c`),
  KEY `t` (`t`(10)),
  KEY `v` (`v`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
select count(*) from t1 where v='a';
count(*)
10
select count(*) from t1 where v='a  ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ' and v between 'a  ' and 'b\n';
count(*)
10
select count(*) from t1 where v like 'a%';
count(*)
11
select count(*) from t1 where v like 'a %';
count(*)
9
explain select count(*) from t1 where v='a  ';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	303	const	#	Using where; Using index
explain select count(*) from t1 where v like 'a%';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	v	v	303	NULL	#	Using where; Using index
explain select count(*) from t1 where v between 'a' and 'a ';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	303	const	#	Using where; Using index
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a  ' and 'b\n';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	303	const	#	Using where; Using index
explain select * from t1 where v='a';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	303	const	#	Using index condition
select v,count(*) from t1 group by v limit 10;
v	count(*)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select v,count(t) from t1 group by v limit 10;
v	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select sql_big_result v,count(t) from t1 group by v limit 10;
v	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
alter table t1 drop key v, add key v (v(30));
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` varchar(300) DEFAULT NULL,
  `c` char(10) DEFAULT NULL,
  `t` text,
  KEY `c` (`c`),
  KEY `t` (`t`(10)),
  KEY `v` (`v`(30))
) ENGINE=InnoDB DEFAULT CHARSET=latin1
select count(*) from t1 where v='a';
count(*)
10
select count(*) from t1 where v='a  ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ';
count(*)
10
select count(*) from t1 where v between 'a' and 'a ' and v between 'a  ' and 'b\n';
count(*)
10
select count(*) from t1 where v like 'a%';
count(*)
11
select count(*) from t1 where v like 'a %';
count(*)
9
explain select count(*) from t1 where v='a  ';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	33	const	#	Using where
explain select count(*) from t1 where v like 'a%';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	v	v	33	NULL	#	Using where
explain select count(*) from t1 where v between 'a' and 'a ';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	33	const	#	Using where
explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a  ' and 'b\n';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	33	const	#	Using where
explain select * from t1 where v='a';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	v	v	33	const	#	Using where
select v,count(*) from t1 group by v limit 10;
v	count(*)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select v,count(t) from t1 group by v limit 10;
v	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select sql_big_result v,count(t) from t1 group by v limit 10;
v	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
alter table t1 modify v varchar(600), drop key v, add key v (v);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` varchar(600) DEFAULT NULL,
  `c` char(10) DEFAULT NULL,
  `t` text,
  KEY `c` (`c`),
  KEY `t` (`t`(10)),
  KEY `v` (`v`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
select v,count(*) from t1 group by v limit 10;
v	count(*)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select v,count(t) from t1 group by v limit 10;
v	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
select sql_big_result v,count(t) from t1 group by v limit 10;
v	count(t)
a	1
a	10
b	10
c	10
d	10
e	10
f	10
g	10
h	10
i	10
drop table t1;
create table t1 (a char(10), unique (a));
insert into t1 values ('a   ');
insert into t1 values ('a ');
ERROR 23000: Duplicate entry 'a' for key 'a'
alter table t1 modify a varchar(10);
insert into t1 values ('a '),('a  '),('a   '),('a         ');
ERROR 23000: Duplicate entry 'a ' for key 'a'
insert into t1 values ('a     ');
ERROR 23000: Duplicate entry 'a     ' for key 'a'
insert into t1 values ('a          ');
ERROR 23000: Duplicate entry 'a         ' for key 'a'
insert into t1 values ('a ');
ERROR 23000: Duplicate entry 'a ' for key 'a'
update t1 set a='a  ' where a like 'a%';
select concat(a,'.') from t1;
concat(a,'.')
a  .
update t1 set a='abc    ' where a like 'a ';
select concat(a,'.') from t1;
concat(a,'.')
a  .
update t1 set a='a      ' where a like 'a %';
select concat(a,'.') from t1;
concat(a,'.')
a      .
update t1 set a='a  ' where a like 'a      ';
select concat(a,'.') from t1;
concat(a,'.')
a  .
drop table t1;
create table t1 (v varchar(10), c char(10), t text, key(v(5)), key(c(5)), key(t(5)));
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` varchar(10) DEFAULT NULL,
  `c` char(10) DEFAULT NULL,
  `t` text,
  KEY `v` (`v`(5)),
  KEY `c` (`c`(5)),
  KEY `t` (`t`(5))
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t1;
create table t1 (v char(10) character set utf8);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` char(10) CHARACTER SET utf8 DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t1;
create table t1 (v varchar(10), c char(10)) row_format=fixed;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` varchar(10) DEFAULT NULL,
  `c` char(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=FIXED
insert into t1 values('a','a'),('a ','a ');
select concat('*',v,'*',c,'*') from t1;
concat('*',v,'*',c,'*')
*a*a*
*a *a*
drop table t1;
create table t1 (v varchar(65530), key(v(10)));
insert into t1 values(repeat('a',65530));
select length(v) from t1 where v=repeat('a',65530);
length(v)
65530
drop table t1;
create table t1(a int, b varchar(12), key ba(b, a));
insert into t1 values (1, 'A'), (20, NULL);
explain select * from t1 where a=20 and b is null;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	ba	ba	20	const,const	1	Using where; Using index
select * from t1 where a=20 and b is null;
a	b
20	NULL
drop table t1;
create table t1 (v varchar(65530), key(v));
Warnings:
Warning	1071	Specified key was too long; max key length is 767 bytes
drop table t1;
create table t1 (v varchar(65536));
Warnings:
Note	1246	Converting column 'v' from VARCHAR to TEXT
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` mediumtext
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t1;
create table t1 (v varchar(65530) character set utf8);
Warnings:
Note	1246	Converting column 'v' from VARCHAR to TEXT
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `v` mediumtext CHARACTER SET utf8
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t1;
set storage_engine=MyISAM;
create table t1 (v varchar(16384)) engine=innodb;
drop table t1;
create table t1 (a char(1), b char(1), key(a, b)) engine=innodb;
insert into t1 values ('8', '6'), ('4', '7');
select min(a) from t1;
min(a)
4
select min(b) from t1 where a='8';
min(b)
6
drop table t1;
CREATE TABLE t1 ( `a` int(11) NOT NULL auto_increment, `b` int(11) default NULL,PRIMARY KEY  (`a`),UNIQUE KEY `b` (`b`)) ENGINE=innodb;
insert into t1 (b) values (1);
replace into t1 (b) values (2), (1), (3);
select * from t1;
a	b
3	1
2	2
4	3
truncate table t1;
insert into t1 (b) values (1);
replace into t1 (b) values (2);
replace into t1 (b) values (1);
replace into t1 (b) values (3);
select * from t1;
a	b
3	1
2	2
4	3
drop table t1;
create table t1 (rowid int not null auto_increment, val int not null,primary
key (rowid), unique(val)) engine=innodb;
replace into t1 (val) values ('1'),('2');
replace into t1 (val) values ('1'),('2');
insert into t1 (val) values ('1'),('2');
ERROR 23000: Duplicate entry '1' for key 'val'
select * from t1;
rowid	val
3	1
4	2
drop table t1;
create table t1 (a int not null auto_increment primary key, val int) engine=InnoDB;
insert into t1 (val) values (1);
update t1 set a=2 where a=1;
insert into t1 (val) values (1);
ERROR 23000: Duplicate entry '2' for key 'PRIMARY'
select * from t1;
a	val
2	1
drop table t1;
CREATE TABLE t1 (GRADE DECIMAL(4) NOT NULL, PRIMARY KEY (GRADE)) ENGINE=INNODB;
INSERT INTO t1 (GRADE) VALUES (151),(252),(343);
SELECT GRADE  FROM t1 WHERE GRADE > 160 AND GRADE < 300;
GRADE
252
SELECT GRADE  FROM t1 WHERE GRADE= 151;
GRADE
151
DROP TABLE t1;
create table t1 (f1 varchar(10), f2 varchar(10), primary key (f1,f2)) engine=innodb;
create table t2 (f3 varchar(10), f4 varchar(10), key (f4)) engine=innodb;
insert into t2 values ('aa','cc');
insert into t1 values ('aa','bb'),('aa','cc');
delete t1 from t1,t2 where f1=f3 and f4='cc';
select * from t1;
f1	f2
drop table t1,t2;
CREATE TABLE t1 (
id INTEGER NOT NULL AUTO_INCREMENT, PRIMARY KEY (id)
) ENGINE=InnoDB;
CREATE TABLE t2 (
id INTEGER NOT NULL,
FOREIGN KEY (id) REFERENCES t1 (id)
) ENGINE=InnoDB;
INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
id
1
TRUNCATE t1;
INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
id
1
DELETE FROM t1;
TRUNCATE t1;
INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
id
1
DROP TABLE t2, t1;
CREATE TABLE t1
(
id INT PRIMARY KEY
) ENGINE=InnoDB;
CREATE TEMPORARY TABLE t2
(
id INT NOT NULL PRIMARY KEY,
b INT,
FOREIGN KEY (b) REFERENCES test.t1(id)
) ENGINE=InnoDB;
Got one of the listed errors
DROP TABLE t1;
create table t1 (col1 varchar(2000), index (col1(767)))
character set = latin1 engine = innodb;
create table t2 (col1 char(255), index (col1))
character set = latin1 engine = innodb;
create table t3 (col1 binary(255), index (col1))
character set = latin1 engine = innodb;
create table t4 (col1 varchar(767), index (col1))
character set = latin1 engine = innodb;
create table t5 (col1 varchar(767) primary key)
character set = latin1 engine = innodb;
create table t6 (col1 varbinary(767) primary key)
character set = latin1 engine = innodb;
create table t7 (col1 text, index(col1(767)))
character set = latin1 engine = innodb;
create table t8 (col1 blob, index(col1(767)))
character set = latin1 engine = innodb;
create table t9 (col1 varchar(512), col2 varchar(512), index(col1, col2))
character set = latin1 engine = innodb;
show create table t9;
Table	Create Table
t9	CREATE TABLE `t9` (
  `col1` varchar(512) DEFAULT NULL,
  `col2` varchar(512) DEFAULT NULL,
  KEY `col1` (`col1`,`col2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t1, t2, t3, t4, t5, t6, t7, t8, t9;
create table t1 (col1 varchar(768), index(col1))
character set = latin1 engine = innodb;
Warnings:
Warning	1071	Specified key was too long; max key length is 767 bytes
create table t2 (col1 varbinary(768), index(col1))
character set = latin1 engine = innodb;
Warnings:
Warning	1071	Specified key was too long; max key length is 767 bytes
create table t3 (col1 text, index(col1(768)))
character set = latin1 engine = innodb;
Warnings:
Warning	1071	Specified key was too long; max key length is 767 bytes
create table t4 (col1 blob, index(col1(768)))
character set = latin1 engine = innodb;
Warnings:
Warning	1071	Specified key was too long; max key length is 767 bytes
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `col1` varchar(768) DEFAULT NULL,
  KEY `col1` (`col1`(767))
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t1, t2, t3, t4;
create table t1 (col1 varchar(768) primary key)
character set = latin1 engine = innodb;
ERROR 42000: Specified key was too long; max key length is 767 bytes
create table t2 (col1 varbinary(768) primary key)
character set = latin1 engine = innodb;
ERROR 42000: Specified key was too long; max key length is 767 bytes
create table t3 (col1 text, primary key(col1(768)))
character set = latin1 engine = innodb;
ERROR 42000: Specified key was too long; max key length is 767 bytes
create table t4 (col1 blob, primary key(col1(768)))
character set = latin1 engine = innodb;
ERROR 42000: Specified key was too long; max key length is 767 bytes
CREATE TABLE t1
(
id INT PRIMARY KEY
) ENGINE=InnoDB;
CREATE TABLE t2
(
v INT,
CONSTRAINT c1 FOREIGN KEY (v) REFERENCES t1(id)
) ENGINE=InnoDB;
INSERT INTO t2 VALUES(2);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c1` FOREIGN KEY (`v`) REFERENCES `t1` (`id`))
INSERT INTO t1 VALUES(1);
INSERT INTO t2 VALUES(1);
DELETE FROM t1 WHERE id = 1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c1` FOREIGN KEY (`v`) REFERENCES `t1` (`id`))
DROP TABLE t1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails
SET FOREIGN_KEY_CHECKS=0;
DROP TABLE t1;
SET FOREIGN_KEY_CHECKS=1;
INSERT INTO t2 VALUES(3);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c1` FOREIGN KEY (`v`) REFERENCES `t1` (`id`))
DROP TABLE t2;
create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1),(2);
set autocommit=0;
checksum table t1;
Table	Checksum
test.t1	1531596814
insert into t1 values(3);
checksum table t1;
Table	Checksum
test.t1	1531596814
commit;
checksum table t1;
Table	Checksum
test.t1	2050879373
commit;
drop table t1;
create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1),(2);
set autocommit=1;
checksum table t1;
Table	Checksum
test.t1	1531596814
set autocommit=1;
insert into t1 values(3);
checksum table t1;
Table	Checksum
test.t1	2050879373
drop table t1;
set foreign_key_checks=0;
create table t2 (a int primary key, b int, foreign key (b) references t1(a)) engine = innodb;
create table t1(a char(10) primary key, b varchar(20)) engine = innodb;
ERROR HY000: Can't create table 'test.t1' (errno: 150)
set foreign_key_checks=1;
drop table t2;
set foreign_key_checks=0;
create table t1(a varchar(10) primary key) engine = innodb DEFAULT CHARSET=latin1;
create table t2 (a varchar(10), foreign key (a) references t1(a)) engine = innodb DEFAULT CHARSET=utf8;
ERROR HY000: Can't create table 'test.t2' (errno: 150)
set foreign_key_checks=1;
drop table t1;
set foreign_key_checks=0;
create table t2 (a varchar(10), foreign key (a) references t1(a)) engine = innodb;
create table t1(a varchar(10) primary key) engine = innodb;
alter table t1 modify column a int;
Got one of the listed errors
set foreign_key_checks=1;
drop table t2,t1;
set foreign_key_checks=0;
create table t2 (a varchar(10), foreign key (a) references t1(a)) engine = innodb DEFAULT CHARSET=latin1;
create table t1(a varchar(10) primary key) engine = innodb DEFAULT CHARSET=latin1;
alter table t1 convert to character set utf8;
set foreign_key_checks=1;
drop table t2,t1;
set foreign_key_checks=0;
create table t2 (a varchar(10), foreign key (a) references t1(a)) engine = innodb DEFAULT CHARSET=latin1;
create table t3(a varchar(10) primary key) engine = innodb DEFAULT CHARSET=utf8;
rename table t3 to t1;
ERROR HY000: Error on rename of './test/t3' to './test/t1' (errno: 150)
set foreign_key_checks=1;
drop table t2,t3;
create table t1(a int primary key) row_format=redundant engine=innodb;
create table t2(a int primary key,constraint foreign key(a)references t1(a)) row_format=compact engine=innodb;
create table t3(a int primary key) row_format=compact engine=innodb;
create table t4(a int primary key,constraint foreign key(a)references t3(a)) row_format=redundant engine=innodb;
insert into t1 values(1);
insert into t3 values(1);
insert into t2 values(2);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
insert into t4 values(2);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
insert into t2 values(1);
insert into t4 values(1);
update t1 set a=2;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
update t2 set a=2;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
update t3 set a=2;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
update t4 set a=2;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
truncate t1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
truncate t3;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
truncate t2;
truncate t4;
truncate t1;
truncate t3;
drop table t4,t3,t2,t1;
create table t1 (a varchar(255) character set utf8mb3,
b varchar(255) character set utf8mb3,
c varchar(255) character set utf8mb3,
d varchar(255) character set utf8mb3,
key (a,b,c,d)) engine=innodb;
drop table t1;
create table t1 (a varchar(255) character set utf8mb3,
b varchar(255) character set utf8mb3,
c varchar(255) character set utf8mb3,
d varchar(255) character set utf8mb3,
e varchar(255) character set utf8mb3,
key (a,b,c,d,e)) engine=innodb;
ERROR 42000: Specified key was too long; max key length is 3500 bytes
create table t1 (s1 varbinary(2),primary key (s1)) engine=innodb;
create table t2 (s1 binary(2),primary key (s1)) engine=innodb;
create table t3 (s1 varchar(2) binary,primary key (s1)) engine=innodb;
create table t4 (s1 char(2) binary,primary key (s1)) engine=innodb;
insert into t1 values (0x41),(0x4120),(0x4100);
insert into t2 values (0x41),(0x4120),(0x4100);
ERROR 23000: Duplicate entry 'A' for key 'PRIMARY'
insert into t2 values (0x41),(0x4120);
insert into t3 values (0x41),(0x4120),(0x4100);
ERROR 23000: Duplicate entry 'A ' for key 'PRIMARY'
insert into t3 values (0x41),(0x4100);
insert into t4 values (0x41),(0x4120),(0x4100);
ERROR 23000: Duplicate entry 'A' for key 'PRIMARY'
insert into t4 values (0x41),(0x4100);
select hex(s1) from t1;
hex(s1)
41
4100
4120
select hex(s1) from t2;
hex(s1)
4100
4120
select hex(s1) from t3;
hex(s1)
4100
41
select hex(s1) from t4;
hex(s1)
4100
41
drop table t1,t2,t3,t4;
create table t1 (a int primary key,s1 varbinary(3) not null unique) engine=innodb;
create table t2 (s1 binary(2) not null, constraint c foreign key(s1) references t1(s1) on update cascade) engine=innodb;
insert into t1 values(1,0x4100),(2,0x41),(3,0x4120),(4,0x42);
insert into t2 values(0x42);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
insert into t2 values(0x41);
select hex(s1) from t2;
hex(s1)
4100
update t1 set s1=0x123456 where a=2;
select hex(s1) from t2;
hex(s1)
4100
update t1 set s1=0x12 where a=1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
update t1 set s1=0x12345678 where a=1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
update t1 set s1=0x123457 where a=1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
update t1 set s1=0x1220 where a=1;
select hex(s1) from t2;
hex(s1)
1220
update t1 set s1=0x1200 where a=1;
select hex(s1) from t2;
hex(s1)
1200
update t1 set s1=0x4200 where a=1;
select hex(s1) from t2;
hex(s1)
4200
delete from t1 where a=1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
delete from t1 where a=2;
update t2 set s1=0x4120;
delete from t1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
delete from t1 where a!=3;
select a,hex(s1) from t1;
a	hex(s1)
3	4120
select hex(s1) from t2;
hex(s1)
4120
drop table t2,t1;
create table t1 (a int primary key,s1 varchar(2) binary not null unique) engine=innodb;
create table t2 (s1 char(2) binary not null, constraint c foreign key(s1) references t1(s1) on update cascade) engine=innodb;
insert into t1 values(1,0x4100),(2,0x41);
insert into t2 values(0x41);
select hex(s1) from t2;
hex(s1)
41
update t1 set s1=0x1234 where a=1;
select hex(s1) from t2;
hex(s1)
41
update t1 set s1=0x12 where a=2;
select hex(s1) from t2;
hex(s1)
12
delete from t1 where a=1;
delete from t1 where a=2;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
select a,hex(s1) from t1;
a	hex(s1)
2	12
select hex(s1) from t2;
hex(s1)
12
drop table t2,t1;
CREATE TABLE t1(a INT, PRIMARY KEY(a)) ENGINE=InnoDB;
CREATE TABLE t2(a INT) ENGINE=InnoDB;
ALTER TABLE t2 ADD FOREIGN KEY (a) REFERENCES t1(a);
ALTER TABLE t2 DROP FOREIGN KEY t2_ibfk_1;
ALTER TABLE t2 ADD CONSTRAINT t2_ibfk_0 FOREIGN KEY (a) REFERENCES t1(a);
ALTER TABLE t2 DROP FOREIGN KEY t2_ibfk_0;
SHOW CREATE TABLE t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `a` int(11) DEFAULT NULL,
  KEY `t2_ibfk_0` (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
DROP TABLE t2,t1;
create table t1(a int not null, b int, c int, d int, primary key(a)) engine=innodb;
insert into t1(a) values (1),(2),(3);
create trigger t1t before insert on t1 for each row begin set NEW.b = NEW.a * 10 + 5, NEW.c = NEW.a / 10; end |
commit;
set autocommit = 0;
update t1 set b = 5 where a = 2;
set autocommit = 0;
insert into t1(a) values (10),(20),(30),(40),(50),(60),(70),(80),(90),(100),
(11),(21),(31),(41),(51),(61),(71),(81),(91),(101),
(12),(22),(32),(42),(52),(62),(72),(82),(92),(102),
(13),(23),(33),(43),(53),(63),(73),(83),(93),(103),
(14),(24),(34),(44),(54),(64),(74),(84),(94),(104);
commit;
commit;
drop trigger t1t;
drop table t1;
create table t1(a int not null, b int, c int, d int, primary key(a)) engine=innodb;
create table t2(a int not null, b int, c int, d int, primary key(a)) engine=innodb;
create table t3(a int not null, b int, c int, d int, primary key(a)) engine=innodb;
create table t4(a int not null, b int, c int, d int, primary key(a)) engine=innodb;
create table t5(a int not null, b int, c int, d int, primary key(a)) engine=innodb;
insert into t1(a) values (1),(2),(3);
insert into t2(a) values (1),(2),(3);
insert into t3(a) values (1),(2),(3);
insert into t4(a) values (1),(2),(3);
insert into t3(a) values (5),(7),(8);
insert into t4(a) values (5),(7),(8);
insert into t5(a) values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12);
create trigger t1t before insert on t1 for each row begin 
INSERT INTO t2 SET a = NEW.a;
end |
create trigger t2t before insert on t2 for each row begin
DELETE FROM t3 WHERE a = NEW.a;
end |
create trigger t3t before delete on t3 for each row begin  
UPDATE t4 SET b = b + 1 WHERE a = OLD.a;
end |
create trigger t4t before update on t4 for each row begin
UPDATE t5 SET b = b + 1 where a = NEW.a;
end |
commit;
set autocommit = 0;
update t1 set b = b + 5 where a = 1;
update t2 set b = b + 5 where a = 1;
update t3 set b = b + 5 where a = 1;
update t4 set b = b + 5 where a = 1;
insert into t5(a) values(20);
set autocommit = 0;
insert into t1(a) values(7);
insert into t2(a) values(8);
delete from t2 where a = 3;
update t4 set b = b + 1 where a = 3;
commit;
commit;
drop trigger t1t;
drop trigger t2t;
drop trigger t3t;
drop trigger t4t;
drop table t1, t2, t3, t4, t5;
CREATE TABLE t1 (
field1 varchar(8) NOT NULL DEFAULT '',
field2 varchar(8) NOT NULL DEFAULT '',
PRIMARY KEY  (field1, field2)
) ENGINE=InnoDB;
CREATE TABLE t2 (
field1 varchar(8) NOT NULL DEFAULT '' PRIMARY KEY,
FOREIGN KEY (field1) REFERENCES t1 (field1)
ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB;
INSERT INTO t1 VALUES ('old', 'somevalu');
INSERT INTO t1 VALUES ('other', 'anyvalue');
INSERT INTO t2 VALUES ('old');
INSERT INTO t2 VALUES ('other');
UPDATE t1 SET field1 = 'other' WHERE field2 = 'somevalu';
ERROR 23000: Upholding foreign key constraints for table 't1', entry 'other-somevalu', key 1 would lead to a duplicate entry
DROP TABLE t2;
DROP TABLE t1;
create table t1 (
c1 bigint not null,
c2 bigint not null,
primary key (c1),
unique  key (c2)
) engine=innodb;
create table t2 (
c1 bigint not null,
primary key (c1)
) engine=innodb;
alter table t1 add constraint c2_fk foreign key (c2)
references t2(c1) on delete cascade;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` bigint(20) NOT NULL,
  `c2` bigint(20) NOT NULL,
  PRIMARY KEY (`c1`),
  UNIQUE KEY `c2` (`c2`),
  CONSTRAINT `c2_fk` FOREIGN KEY (`c2`) REFERENCES `t2` (`c1`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1
alter table t1 drop foreign key c2_fk;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` bigint(20) NOT NULL,
  `c2` bigint(20) NOT NULL,
  PRIMARY KEY (`c1`),
  UNIQUE KEY `c2` (`c2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t1, t2;
create table t1(a date) engine=innodb;
create table t2(a date, key(a)) engine=innodb;
insert into t1 values('2005-10-01');
insert into t2 values('2005-10-01');
select * from t1, t2
where t2.a between t1.a - interval 2 day and t1.a + interval 2 day;
a	a
2005-10-01	2005-10-01
drop table t1, t2;
create table t1 (id int not null, f_id int not null, f int not null,
primary key(f_id, id)) engine=innodb;
create table t2 (id int not null,s_id int not null,s varchar(200),
primary key(id)) engine=innodb;
INSERT INTO t1 VALUES (8, 1, 3);
INSERT INTO t1 VALUES (1, 2, 1);
INSERT INTO t2 VALUES (1, 0, '');
INSERT INTO t2 VALUES (8, 1, '');
commit;
DELETE ml.* FROM t1 AS ml LEFT JOIN t2 AS mm ON (mm.id=ml.id)
WHERE mm.id IS NULL;
select ml.* from t1 as ml left join t2 as mm on (mm.id=ml.id)
where mm.id is null lock in share mode;
id	f_id	f
drop table t1,t2;
create table t1(a int not null, b int, primary key(a)) engine=innodb;
insert into t1 values(1,1),(2,2),(3,1),(4,2),(5,1),(6,2),(7,3);
commit;
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
update t1 set b = 5 where b = 1;
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
select * from t1 where a = 7 and b = 3 for update;
a	b
7	3
commit;
commit;
drop table t1;
create table t1(a int not null, b int, primary key(a)) engine=innodb;
insert into t1 values(1,1),(2,2),(3,1),(4,2),(5,1),(6,2);
commit;
set autocommit = 0;
select * from t1 lock in share mode;
a	b
1	1
2	2
3	1
4	2
5	1
6	2
update t1 set b = 5 where b = 1;
set autocommit = 0;
select * from t1 where a = 2 and b = 2 for update;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
commit;
commit;
drop table t1;
create table t1(a int not null, b int, primary key(a)) engine=innodb;
insert into t1 values (1,2),(5,3),(4,2);
create table t2(d int not null, e int, primary key(d)) engine=innodb;
insert into t2 values (8,6),(12,1),(3,1);
commit;
set autocommit = 0;
select * from t2 for update;
d	e
3	1
8	6
12	1
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
insert into t1 select * from t2;
update t1 set b = (select e from t2 where a = d);
create table t3(d int not null, e int, primary key(d)) engine=innodb
select * from t2;
commit;
commit;
drop table t1, t2, t3;
create table t1(a int not null, b int, primary key(a)) engine=innodb;
insert into t1 values (1,2),(5,3),(4,2);
create table t2(a int not null, b int, primary key(a)) engine=innodb;
insert into t2 values (8,6),(12,1),(3,1);
create table t3(d int not null, b int, primary key(d)) engine=innodb;
insert into t3 values (8,6),(12,1),(3,1);
create table t5(a int not null, b int, primary key(a)) engine=innodb;
insert into t5 values (1,2),(5,3),(4,2);
create table t6(d int not null, e int, primary key(d)) engine=innodb;
insert into t6 values (8,6),(12,1),(3,1);
create table t8(a int not null, b int, primary key(a)) engine=innodb;
insert into t8 values (1,2),(5,3),(4,2);
create table t9(d int not null, e int, primary key(d)) engine=innodb;
insert into t9 values (8,6),(12,1),(3,1);
commit;
set autocommit = 0;
select * from t2 for update;
a	b
3	1
8	6
12	1
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
insert into t1 select * from t2;
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
update t3 set b = (select b from t2 where a = d);
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
create table t4(a int not null, b int, primary key(a)) engine=innodb select * from t2;
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
insert into t5 (select * from t2 lock in share mode);
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
update t6 set e = (select b from t2 where a = d lock in share mode);
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
create table t7(a int not null, b int, primary key(a)) engine=innodb select * from t2 lock in share mode;
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
insert into t8 (select * from t2 for update);
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
update t9 set e = (select b from t2 where a = d for update);
SET binlog_format='MIXED';
set autocommit = 0;
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
create table t10(a int not null, b int, primary key(a)) engine=innodb select * from t2 for update;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
commit;
drop table t1, t2, t3, t5, t6, t8, t9;
CREATE TABLE t1 (DB_ROW_ID int) engine=innodb;
ERROR HY000: Can't create table 'test.t1' (errno: -1)
CREATE TABLE t1 (
a BIGINT(20) NOT NULL,
PRIMARY KEY  (a)
) ENGINE=INNODB DEFAULT CHARSET=UTF8;
CREATE TABLE t2 (
a BIGINT(20) NOT NULL,
b VARCHAR(128) NOT NULL,
c TEXT NOT NULL,
PRIMARY KEY  (a,b),
KEY idx_t2_b_c (b,c(200)),
CONSTRAINT t_fk FOREIGN KEY (a) REFERENCES t1 (a) 
ON DELETE CASCADE
) ENGINE=INNODB DEFAULT CHARSET=UTF8MB3;
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (1, 'bar', 'vbar');
INSERT INTO t2 VALUES (1, 'BAR2', 'VBAR');
INSERT INTO t2 VALUES (1, 'bar_bar', 'bibi');
INSERT INTO t2 VALUES (1, 'customer_over', '1');
SELECT * FROM t2 WHERE b = 'customer_over';
a	b	c
1	customer_over	1
SELECT * FROM t2 WHERE BINARY b = 'customer_over';
a	b	c
1	customer_over	1
SELECT DISTINCT p0.a FROM t2 p0 WHERE p0.b = 'customer_over';
a
1
/* Bang: Empty result set, above was expected: */
SELECT DISTINCT p0.a FROM t2 p0 WHERE BINARY p0.b = 'customer_over';
a
1
SELECT p0.a FROM t2 p0 WHERE BINARY p0.b = 'customer_over';
a
1
drop table t2, t1;
CREATE TABLE t1 ( a int ) ENGINE=innodb;
BEGIN;
INSERT INTO t1 VALUES (1);
OPTIMIZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	note	Table does not support optimize, doing recreate + analyze instead
test.t1	optimize	status	OK
DROP TABLE t1;
CREATE TABLE t1 (id int PRIMARY KEY, f int NOT NULL, INDEX(f)) ENGINE=InnoDB;
CREATE TABLE t2 (id int PRIMARY KEY, f INT NOT NULL,
CONSTRAINT t2_t1 FOREIGN KEY (id) REFERENCES t1 (id)
ON DELETE CASCADE ON UPDATE CASCADE) ENGINE=InnoDB;
ALTER TABLE t2 ADD FOREIGN KEY (f) REFERENCES t1 (f) ON
DELETE CASCADE ON UPDATE CASCADE;
SHOW CREATE TABLE t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `id` int(11) NOT NULL,
  `f` int(11) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `f` (`f`),
  CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`f`) REFERENCES `t1` (`f`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `t2_t1` FOREIGN KEY (`id`) REFERENCES `t1` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1
DROP TABLE t2, t1;
CREATE TABLE t1 (a INT, INDEX(a)) ENGINE=InnoDB;
CREATE TABLE t2 (a INT, INDEX(a)) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (1);
ALTER TABLE t2 ADD FOREIGN KEY (a) REFERENCES t1 (a) ON DELETE SET NULL;
ALTER TABLE t2 MODIFY a INT NOT NULL;
ERROR HY000: Error on rename of '#sql-temporary' to './test/t2' (errno: 150)
DELETE FROM t1;
DROP TABLE t2,t1;
CREATE TABLE t1 (a VARCHAR(5) COLLATE utf8_unicode_ci PRIMARY KEY)
ENGINE=InnoDB;
INSERT INTO t1 VALUES (0xEFBCA4EFBCA4EFBCA4);
DELETE FROM t1;
INSERT INTO t1 VALUES ('DDD');
SELECT * FROM t1;
a
DDD
DROP TABLE t1;
CREATE TABLE t1 (id int PRIMARY KEY AUTO_INCREMENT) ENGINE=InnoDB
AUTO_INCREMENT=42;
INSERT INTO t1 VALUES (0),(347),(0);
SELECT * FROM t1;
id
42
347
348
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=349 DEFAULT CHARSET=latin1
CREATE TABLE t2 (id int PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t2 VALUES(42),(347),(348);
ALTER TABLE t1 ADD CONSTRAINT t1_t2 FOREIGN KEY (id) REFERENCES t2(id);
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`),
  CONSTRAINT `t1_t2` FOREIGN KEY (`id`) REFERENCES `t2` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=349 DEFAULT CHARSET=latin1
DROP TABLE t1,t2;
CREATE TABLE t1 (
c01 CHAR(255), c02 CHAR(255), c03 CHAR(255), c04 CHAR(255),
c05 CHAR(255), c06 CHAR(255), c07 CHAR(255), c08 CHAR(255),
c09 CHAR(255), c10 CHAR(255), c11 CHAR(255), c12 CHAR(255),
c13 CHAR(255), c14 CHAR(255), c15 CHAR(255), c16 CHAR(255),
c17 CHAR(255), c18 CHAR(255), c19 CHAR(255), c20 CHAR(255),
c21 CHAR(255), c22 CHAR(255), c23 CHAR(255), c24 CHAR(255),
c25 CHAR(255), c26 CHAR(255), c27 CHAR(255), c28 CHAR(255),
c29 CHAR(255), c30 CHAR(255), c31 CHAR(255), c32 CHAR(255)
) ENGINE = InnoDB;
ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. You have to change some columns to TEXT or BLOBs
DROP TABLE IF EXISTS t1;
Warnings:
Note	1051	Unknown table 't1'
CREATE TABLE t1(
id BIGINT(20) NOT NULL AUTO_INCREMENT PRIMARY KEY
) ENGINE=InnoDB;
INSERT INTO t1 VALUES(-10);
SELECT * FROM t1;
id
-10
INSERT INTO t1 VALUES(NULL);
SELECT * FROM t1;
id
-10
1
DROP TABLE t1;
SET binlog_format='MIXED';
SET TX_ISOLATION='read-committed';
SET AUTOCOMMIT=0;
DROP TABLE IF EXISTS t1, t2;
Warnings:
Note	1051	Unknown table 't1'
Note	1051	Unknown table 't2'
CREATE TABLE t1 ( a int ) ENGINE=InnoDB;
CREATE TABLE t2 LIKE t1;
SELECT * FROM t2;
a
SET binlog_format='MIXED';
SET TX_ISOLATION='read-committed';
SET AUTOCOMMIT=0;
INSERT INTO t1 VALUES (1);
COMMIT;
SELECT * FROM t1 WHERE a=1;
a
1
SET binlog_format='MIXED';
SET TX_ISOLATION='read-committed';
SET AUTOCOMMIT=0;
SELECT * FROM t2;
a
SET binlog_format='MIXED';
SET TX_ISOLATION='read-committed';
SET AUTOCOMMIT=0;
INSERT INTO t1 VALUES (2);
COMMIT;
SELECT * FROM t1 WHERE a=2;
a
2
SELECT * FROM t1 WHERE a=2;
a
2
DROP TABLE t1;
DROP TABLE t2;
create table t1 (i int, j int) engine=innodb;
insert into t1 (i, j) values (1, 1), (2, 2);
update t1 set j = 2;
affected rows: 1
info: Rows matched: 2  Changed: 1  Warnings: 0
drop table t1;
create table t1 (id int) comment='this is a comment' engine=innodb;
select table_comment, data_free > 0 as data_free_is_set
from information_schema.tables
where table_schema='test' and table_name = 't1';
table_comment	data_free_is_set
this is a comment	1
drop table t1;
CREATE TABLE t1 (
c1 INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
c2 VARCHAR(128) NOT NULL,
PRIMARY KEY(c1)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=100;
CREATE TABLE t2 (
c1 INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
c2 INT(10) UNSIGNED DEFAULT NULL,
PRIMARY KEY(c1)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=200;
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't2';
AUTO_INCREMENT
200
ALTER TABLE t2 ADD CONSTRAINT t1_t2_1 FOREIGN KEY(c1) REFERENCES t1(c1);
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't2';
AUTO_INCREMENT
200
DROP TABLE t2;
DROP TABLE t1;
CREATE TABLE t1 (c1 int default NULL,
c2 int default NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
TRUNCATE TABLE t1;
affected rows: 0
INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4), (5, 5);
affected rows: 5
info: Records: 5  Duplicates: 0  Warnings: 0
TRUNCATE TABLE t1;
affected rows: 0
DROP TABLE t1;
Variable_name	Value
Handler_update	0
Variable_name	Value
Handler_delete	0
Variable_name	Value
Handler_update	1
Variable_name	Value
Handler_delete	1
