SET SQL_WARNINGS=1;
CREATE TABLE t1 (
ID CHAR(32) NOT NULL,
name CHAR(32) NOT NULL,
value CHAR(255),
INDEX indexIDname (ID(8),name(8))
) ;
INSERT INTO t1 VALUES
('keyword','indexdir','/export/home/local/www/database/indexes/keyword');
INSERT INTO t1 VALUES ('keyword','urlprefix','text/ /text');
INSERT INTO t1 VALUES ('keyword','urlmap','/text/ /');
INSERT INTO t1 VALUES ('keyword','attr','personal employee company');
INSERT INTO t1 VALUES
('emailgids','indexdir','/export/home/local/www/database/indexes/emailgids');
INSERT INTO t1 VALUES ('emailgids','urlprefix','text/ /text');
INSERT INTO t1 VALUES ('emailgids','urlmap','/text/ /');
INSERT INTO t1 VALUES ('emailgids','attr','personal employee company');
SELECT value FROM t1 WHERE ID='emailgids' AND name='attr';
value
personal employee company
drop table t1;
CREATE TABLE t1 (
price int(5) DEFAULT '0' NOT NULL,
area varchar(40) DEFAULT '' NOT NULL,
type varchar(40) DEFAULT '' NOT NULL,
transityes enum('Y','N') DEFAULT 'Y' NOT NULL,
shopsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
schoolsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
petsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
KEY price (price,area,type,transityes,shopsyes,schoolsyes,petsyes)
);
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','N','N','N','N');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','N','N','N','N');
INSERT IGNORE INTO t1 VALUES (900,'Vancouver','Shared/Roomate','','','','');
Warnings:
Warning	1265	Data truncated for column 'transityes' at row 1
Warning	1265	Data truncated for column 'shopsyes' at row 1
Warning	1265	Data truncated for column 'schoolsyes' at row 1
Warning	1265	Data truncated for column 'petsyes' at row 1
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
SELECT * FROM t1 WHERE area='Vancouver' and transityes='y' and schoolsyes='y' and ( ((type='1 Bedroom' or type='Studio/Bach') and (price<=500)) or ((type='2 Bedroom') and (price<=550)) or ((type='Shared/Roomate') and (price<=300)) or ((type='Room and Board') and (price<=500)) ) and price <= 400;
price	area	type	transityes	shopsyes	schoolsyes	petsyes
drop table t1;
CREATE TABLE t1 (program enum('signup','unique','sliding') not null,  type enum('basic','sliding','signup'),  sites set('mt'),  PRIMARY KEY (program));
ALTER TABLE t1 modify program enum('signup','unique','sliding');
drop table t1;
CREATE TABLE t1 (
name varchar(50) DEFAULT '' NOT NULL,
author varchar(50) DEFAULT '' NOT NULL,
category decimal(10,0) DEFAULT '0' NOT NULL,
email varchar(50),
password varchar(50),
proxy varchar(50),
bitmap varchar(20),
msg varchar(255),
urlscol varchar(127),
urlhttp varchar(127),
timeout decimal(10,0),
nbcnx decimal(10,0),
creation decimal(10,0),
livinguntil decimal(10,0),
lang decimal(10,0),
type decimal(10,0),
subcat decimal(10,0),
subtype decimal(10,0),
reg char(1),
scs varchar(255),
capacity decimal(10,0),
userISP varchar(50),
CCident varchar(50) DEFAULT '' NOT NULL,
PRIMARY KEY (name,author,category)
);
INSERT INTO t1 VALUES
('patnom','patauteur',0,'p.favre@cryo-networks.fr',NULL,NULL,'#p2sndnq6ae5g1u6t','essai salut','scol://195.242.78.119:patauteur.patnom',NULL,NULL,NULL,950036174,-882087474,NULL,3,0,3,'1','Pub/patnom/futur_divers.scs',NULL,'pat','CC1');
INSERT INTO t1 VALUES
('LeNomDeMonSite','Marc',0,'m.barilley@cryo-networks.fr',NULL,NULL,NULL,NULL,'scol://195.242.78.119:Marc.LeNomDeMonSite',NULL,NULL,NULL,950560434,-881563214,NULL,3,0,3,'1','Pub/LeNomDeMonSite/domus_hibere.scs',NULL,'Marq','CC1');
select * from t1 where name='patnom' and author='patauteur' and category=0;
name	author	category	email	password	proxy	bitmap	msg	urlscol	urlhttp	timeout	nbcnx	creation	livinguntil	lang	type	subcat	subtype	reg	scs	capacity	userISP	CCident
patnom	patauteur	0	p.favre@cryo-networks.fr	NULL	NULL	#p2sndnq6ae5g1u6t	essai salut	scol://195.242.78.119:patauteur.patnom	NULL	NULL	NULL	950036174	-882087474	NULL	3	0	3	1	Pub/patnom/futur_divers.scs	NULL	pat	CC1
drop table t1;
create table t1
(
name_id int not null auto_increment,
name blob,
INDEX name_idx (name(5)),
primary key (name_id)
);
INSERT t1 VALUES(NULL,'/');
INSERT t1 VALUES(NULL,'[T,U]_axpby');
SELECT * FROM t1 WHERE name='[T,U]_axpy';
name_id	name
SELECT * FROM t1 WHERE name='[T,U]_axpby';
name_id	name
2	[T,U]_axpby
create table t2
(
name_id int not null auto_increment,
name char(255) binary,
INDEX name_idx (name(5)),
primary key (name_id)
);
INSERT t2 select * from t1;
SELECT * FROM t2 WHERE name='[T,U]_axpy';
name_id	name
SELECT * FROM t2 WHERE name='[T,U]_axpby';
name_id	name
2	[T,U]_axpby
CREATE TABLE t3 SELECT * FROM t2 WHERE name='[T,U]_axpby';
SELECT * FROM t2 WHERE name='[T,U]_axpby';
name_id	name
2	[T,U]_axpby
drop table t1,t2,t3;
create table t1
(
SEQNO                         numeric(12 ) not null,
MOTYPEID                 numeric(12 ) not null,
MOINSTANCEID     numeric(12 ) not null,
ATTRID                       numeric(12 ) not null,
VALUE                         varchar(120) not null,
primary key (SEQNO, MOTYPEID, MOINSTANCEID, ATTRID, VALUE )
);
INSERT INTO t1 VALUES (1, 1, 1, 1, 'a');
INSERT INTO t1 VALUES (1, 1, 1, 1, 'b');
INSERT INTO t1 VALUES (1, 1, 1, 1, 'a');
ERROR 23000: Duplicate entry '1-1-1-1-a' for key 'PRIMARY'
drop table t1;
CREATE TABLE t1 (
a tinytext NOT NULL,
b tinyint(3) unsigned NOT NULL default '0',
PRIMARY KEY (a(32),b)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('a',1),('a',2);
SELECT * FROM t1 WHERE a='a' AND b=2;
a	b
a	2
SELECT * FROM t1 WHERE a='a' AND b in (2);
a	b
a	2
SELECT * FROM t1 WHERE a='a' AND b in (1,2);
a	b
a	1
a	2
drop table t1;
create table t1 (a int not null unique, b int unique, c int, d int not null primary key, key(c), e int not null unique);
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	Ignored
t1	0	PRIMARY	1	d	A	0	NULL	NULL		BTREE			NO
t1	0	a	1	a	A	0	NULL	NULL		BTREE			NO
t1	0	e	1	e	A	0	NULL	NULL		BTREE			NO
t1	0	b	1	b	A	NULL	NULL	NULL	YES	BTREE			NO
t1	1	c	1	c	A	NULL	NULL	NULL	YES	BTREE			NO
drop table t1;
CREATE TABLE t1 (c CHAR(10) NOT NULL,i INT NOT NULL AUTO_INCREMENT,
UNIQUE (c,i));
INSERT IGNORE INTO t1 (c) VALUES (NULL),(NULL);
Warnings:
Warning	1048	Column 'c' cannot be null
Warning	1048	Column 'c' cannot be null
SELECT * FROM t1;
c	i
	1
	2
INSERT INTO t1 (c) VALUES ('a'),('a');
SELECT * FROM t1;
c	i
	1
	2
a	1
a	2
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (c CHAR(10) NULL, i INT NOT NULL AUTO_INCREMENT,
UNIQUE (c,i));
INSERT INTO t1 (c) VALUES (NULL),(NULL);
SELECT * FROM t1;
c	i
NULL	1
NULL	2
INSERT INTO t1 (c) VALUES ('a'),('a');
SELECT * FROM t1;
c	i
NULL	1
NULL	2
a	1
a	2
drop table t1;
create table t1 (i int, a char(200), b text, unique (a), unique (b(300))) charset utf8;
insert ignore t1 values (1, repeat('a',210), repeat('b', 310));
Warnings:
Warning	1265	Data truncated for column 'a' at row 1
insert ignore t1 values (2, repeat(0xD0B1,215), repeat(0xD0B1, 310));
Warnings:
Warning	1265	Data truncated for column 'a' at row 1
select i, length(a), length(b), char_length(a), char_length(b) from t1;
i	length(a)	length(b)	char_length(a)	char_length(b)
1	200	310	200	310
2	400	620	200	310
select i from t1 where a=repeat(_utf8 'a',200);
i
1
select i from t1 where a=repeat(_utf8 0xD0B1,200);
i
2
select i from t1 where b=repeat(_utf8 'b',310);
i
1
drop table t1;
CREATE TABLE t1 (id int unsigned auto_increment, name char(50), primary key (id)) engine=myisam;
insert into t1 (name) values ('a'), ('b'),('c'),('d'),('e'),('f'),('g');
explain select 1 from t1 where id =2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	Using index
explain select 1 from t1 where id =2 or id=3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using where; Using index
explain select name from t1 where id =2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
ALTER TABLE t1 DROP PRIMARY KEY, ADD INDEX (id);
explain select 1 from t1 where id =2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	id	id	4	const	1	Using index
drop table t1;
CREATE TABLE t1 (numeropost mediumint(8) unsigned NOT NULL default '0', numreponse int(10) unsigned NOT NULL auto_increment, PRIMARY KEY (numeropost,numreponse), UNIQUE KEY numreponse (numreponse));
INSERT INTO t1 (numeropost,numreponse) VALUES ('1','1'),('1','2'),('2','3'),('2','4');
SELECT numeropost FROM t1 WHERE numreponse='1';
numeropost
1
EXPLAIN SELECT numeropost FROM t1 WHERE numreponse='1';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	numreponse	numreponse	4	const	1	
FLUSH TABLES;
SELECT numeropost FROM t1 WHERE numreponse='1';
numeropost
1
EXPLAIN SELECT numreponse+0 FROM t1 WHERE numreponse='1';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	numreponse	numreponse	4	const	1	Using index
drop table t1;
create table t1 (c varchar(30) character set utf8, t text character set utf8, unique (c(2)), unique (t(3))) engine=myisam;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c` varchar(30) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci DEFAULT NULL,
  `t` text CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci DEFAULT NULL,
  UNIQUE KEY `c` (`c`(2)),
  UNIQUE KEY `t` (`t`(3))
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
insert t1 values ('cccc', 'tttt'),
(0xD0B1212223D0B1D0B1D0B1D0B1D0B1, 0xD0B1D0B1212223D0B1D0B1D0B1D0B1),
(0xD0B1222123D0B1D0B1D0B1D0B1D0B1, 0xD0B1D0B1222123D0B1D0B1D0B1D0B1);
insert t1 (c) values ('cc22');
ERROR 23000: Duplicate entry 'cc' for key 'c'
insert t1 (t) values ('ttt22');
ERROR 23000: Duplicate entry 'ttt' for key 't'
insert t1 (c) values (0xD0B1212322D0B1D0B1D0B1D0B1D0B1);
ERROR 23000: Duplicate entry '\0431!' for key 'c'
insert t1 (t) values (0xD0B1D0B1212322D0B1D0B1D0B1D0B1);
ERROR 23000: Duplicate entry '\0431\0431!' for key 't'
select c from t1 where c='cccc';
c
cccc
select t from t1 where t='tttt';
t
tttt
select c from t1 where c=0xD0B1212223D0B1D0B1D0B1D0B1D0B1;
c
?!"#?????
select t from t1 where t=0xD0B1D0B1212223D0B1D0B1D0B1D0B1;
t
??!"#????
drop table t1;
DROP TABLE IF EXISTS t1;
Warnings:
Note	1051	Unknown table 'test.t1'
CREATE TABLE t1 (
c1 int,
c2 varbinary(240),
UNIQUE KEY (c1),
KEY (c2)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,'\Z\Z\Z\Z');
INSERT INTO t1 VALUES (2,'\Z\Z\Z\Z\Z\Z');
INSERT INTO t1 VALUES (3,'\Z\Z\Z\Z');
select c1 from t1 where c2='\Z\Z\Z\Z';
c1
1
3
DELETE FROM t1 WHERE (c1 = 1);
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
select c1 from t1 where c2='\Z\Z\Z\Z';
c1
3
DELETE FROM t1 WHERE (c1 = 3);
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
select c1 from t1 where c2='\Z\Z\Z\Z';
c1
truncate table t1;
insert into t1 values(1,"aaaa"),(2,"aaab"),(3,"aaac"),(4,"aaccc");
delete from t1 where c1=3;
delete from t1 where c1=1;
delete from t1 where c1=4;
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
drop table t1;
create table t1 (c char(10), index (c(0)));
ERROR HY000: Key part 'c' length cannot be 0
create table t1 (c char(10), index (c,c));
ERROR 42S21: Duplicate column name 'c'
create table t1 (c1 char(10), c2 char(10), index (c1,c2,c1));
ERROR 42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10), index (c1,c1,c2));
ERROR 42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10), index (c2,c1,c1));
ERROR 42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10));
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 (
i1 INT NOT NULL,
i2 INT NOT NULL,
UNIQUE i1idx (i1),
UNIQUE i2idx (i2));
desc t1;
Field	Type	Null	Key	Default	Extra
i1	int(11)	NO	PRI	NULL	
i2	int(11)	NO	UNI	NULL	
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `i1` int(11) NOT NULL,
  `i2` int(11) NOT NULL,
  UNIQUE KEY `i1idx` (`i1`),
  UNIQUE KEY `i2idx` (`i2`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
create table t1 (
c1 int,
c2 varchar(20) not null,
primary key (c1),
key (c2(10))
) engine=myisam;
insert into t1 values (1,'');
insert into t1 values (2,' \t\tTest String');
insert into t1 values (3,' \n\tTest String');
update t1 set c2 = 'New Test String' where c1 = 1;
select * from t1;
c1	c2
1	New Test String
2	 		Test String
3	 
	Test String
drop table t1;
create table t1 (a varchar(10), b varchar(10), key(a(10),b(10)));
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` varchar(10) DEFAULT NULL,
  `b` varchar(10) DEFAULT NULL,
  KEY `a` (`a`,`b`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
alter table t1 modify b varchar(20);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` varchar(10) DEFAULT NULL,
  `b` varchar(20) DEFAULT NULL,
  KEY `a` (`a`,`b`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
alter table t1 modify a varchar(20);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` varchar(20) DEFAULT NULL,
  `b` varchar(20) DEFAULT NULL,
  KEY `a` (`a`,`b`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
create table t1 (a int not null primary key, b varchar(20) not null unique);
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	PRI	NULL	
b	varchar(20)	NO	UNI	NULL	
drop table t1;
create table t1 (a int not null primary key, b int not null unique);
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	PRI	NULL	
b	int(11)	NO	UNI	NULL	
drop table t1;
create table t1 (a int not null primary key, b varchar(20) not null, unique (b(10)));
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	PRI	NULL	
b	varchar(20)	NO	UNI	NULL	
drop table t1;
create table t1 (a int not null primary key, b varchar(20) not null, c varchar(20) not null, unique(b(10),c(10)));
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	PRI	NULL	
b	varchar(20)	NO	MUL	NULL	
c	varchar(20)	NO		NULL	
drop table t1;
create table t1 (
c1 int,
c2 char(12),
c3 varchar(123),
c4 timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
index (c1),
index i1 (c1),
index i2 (c2),
index i3 (c3),
unique i4 (c4),
index i5 (c1, c2, c3, c4),
primary key (c2, c3),
index (c2, c4));
Warnings:
Note	1831	Duplicate index `i1`. This is deprecated and will be disallowed in a future release
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) DEFAULT NULL,
  `c2` char(12) NOT NULL,
  `c3` varchar(123) NOT NULL,
  `c4` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
  PRIMARY KEY (`c2`,`c3`),
  UNIQUE KEY `i4` (`c4`),
  KEY `c1` (`c1`),
  KEY `i1` (`c1`),
  KEY `i2` (`c2`),
  KEY `i3` (`c3`),
  KEY `i5` (`c1`,`c2`,`c3`,`c4`),
  KEY `c2` (`c2`,`c4`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
alter table t1 drop index c1;
alter table t1 add index (c1);
Warnings:
Note	1831	Duplicate index `c1`. This is deprecated and will be disallowed in a future release
alter table t1 add index (c1);
Warnings:
Note	1831	Duplicate index `c1_2`. This is deprecated and will be disallowed in a future release
alter table t1 drop index i3;
alter table t1 add index i3 (c3);
alter table t1 drop index i2, drop index i4;
alter table t1 add index i2 (c2), add index i4 (c4);
alter table t1 drop index i2, drop index i4, add index i6 (c2, c4);
Warnings:
Note	1831	Duplicate index `i6`. This is deprecated and will be disallowed in a future release
alter table t1 add index i2 (c2), add index i4 (c4), drop index i6;
alter table t1 drop index i2, drop index i4, add unique i4 (c4);
alter table t1 add index i2 (c2), drop index i4, add index i4 (c4);
alter table t1 drop index c2, add index (c2(4),c3(7));
alter table t1 drop index c2, add index (c2(4),c3(7));
alter table t1 add primary key (c1, c2), drop primary key;
alter table t1 drop primary key;
alter table t1 add primary key (c1, c2), drop primary key;
ERROR 42000: Can't DROP INDEX `PRIMARY`; check that it exists
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  `c2` char(12) NOT NULL,
  `c3` varchar(123) NOT NULL,
  `c4` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
  KEY `i1` (`c1`),
  KEY `i5` (`c1`,`c2`,`c3`,`c4`),
  KEY `c1` (`c1`),
  KEY `c1_2` (`c1`),
  KEY `i3` (`c3`),
  KEY `i2` (`c2`),
  KEY `i4` (`c4`),
  KEY `c2` (`c2`(4),`c3`(7))
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
insert into t1 values(1, 'a', 'a', NULL);
insert into t1 values(1, 'b', 'b', NULL);
alter table t1 drop index i3, drop index i2, drop index i1;
alter table t1 add index i3 (c3), add index i2 (c2), add unique index i1 (c1);
ERROR 23000: Duplicate entry '1' for key 'i1'
drop table t1;
CREATE TABLE t1( a TINYINT, KEY(a) ) ENGINE=MyISAM;
INSERT INTO t1 VALUES( 1 );
ALTER TABLE t1 DISABLE KEYS;
EXPLAIN SELECT MAX(a) FROM t1 FORCE INDEX(a);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
drop table t1;
CREATE TABLE t1 (
a INTEGER auto_increment PRIMARY KEY,
b INTEGER NOT NULL,
c INTEGER NOT NULL,
d CHAR(64)
);
CREATE TABLE t2 (
a INTEGER auto_increment PRIMARY KEY,
b INTEGER NOT NULL,
c SMALLINT NOT NULL,
d DATETIME NOT NULL,
e SMALLINT NOT NULL,
f INTEGER NOT NULL,
g INTEGER NOT NULL,  
h SMALLINT NOT NULL,
i INTEGER NOT NULL,
j INTEGER NOT NULL,
UNIQUE INDEX (b),
INDEX (b, d, e, f, g, h, i, j, c),
INDEX (c)
);
INSERT INTO t2 VALUES 
(NULL, 1, 254, '1000-01-01 00:00:00', 257, 0, 0, 0, 0, 0),
(NULL, 2, 1, '2004-11-30 12:00:00', 1, 0, 0, 0, 0, 0),
(NULL, 3, 1, '2004-11-30 12:00:00', 1, 0, 0, 2, -21600, 0),
(NULL, 4, 1, '2004-11-30 12:00:00', 1, 0, 0, 2, -10800, 0),
(NULL, 5, 1, '2004-11-30 12:00:00', 1, 0, 0, 5, -10800, 0),
(NULL, 6, 1, '2004-11-30 12:00:00', 102, 0, 0, 0, 0, 0),
(NULL, 7, 1, '2004-11-30 12:00:00', 105, 2, 0, 0, 0, 0),
(NULL, 8, 1, '2004-11-30 12:00:00', 105, 10, 0, 0, 0, 0);
INSERT INTO t1 (b, c, d) VALUES
(3388000, -553000, NULL),
(3388000, -553000, NULL);
SELECT *
FROM t2 c JOIN t1 pa ON c.b = pa.a 
WHERE c.c = 1
ORDER BY c.b, c.d
;
a	b	c	d	e	f	g	h	i	j	a	b	c	d
2	2	1	2004-11-30 12:00:00	1	0	0	0	0	0	2	3388000	-553000	NULL
DROP TABLE t1, t2;
create table t1(a int not null, key aa(a), 
b char(10) not null, unique key bb(b(1)), 
c char(4) not null, unique key cc(c));
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	MUL	NULL	
b	char(10)	NO	UNI	NULL	
c	char(4)	NO	PRI	NULL	
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` char(10) NOT NULL,
  `c` char(4) NOT NULL,
  UNIQUE KEY `cc` (`c`),
  UNIQUE KEY `bb` (`b`(1)),
  KEY `aa` (`a`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
create table t1(a int not null, key aa(a), 
b char(10) not null, unique key bb(b(1)),
c char(4) not null);
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	MUL	NULL	
b	char(10)	NO	UNI	NULL	
c	char(4)	NO		NULL	
alter table t1 add unique key cc(c);
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	MUL	NULL	
b	char(10)	NO	UNI	NULL	
c	char(4)	NO	PRI	NULL	
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` char(10) NOT NULL,
  `c` char(4) NOT NULL,
  UNIQUE KEY `cc` (`c`),
  UNIQUE KEY `bb` (`b`(1)),
  KEY `aa` (`a`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
End of 5.0 tests
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a INT PRIMARY KEY AUTO_INCREMENT);
INSERT INTO t1 VALUES (), (), ();
SELECT 1 AS c1
FROM t1
ORDER BY (
SELECT 1 AS c2
FROM t1
GROUP BY GREATEST(LAST_INSERT_ID(), t1.a) ASC
LIMIT 1);
c1
1
1
1
DROP TABLE t1;
CREATE TABLE t1 (a INT, b INT, INDEX (a,b));
INSERT INTO t1 (a, b)
VALUES
(1,1), (1,2), (1,3), (1,4), (1,5),
(2,2), (2,3), (2,1), (3,1), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6);
ANALYZE table t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE 
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
2	SUBQUERY	t1	range	a	a	5	NULL	2	Using where; Using index for group-by
SELECT 1 as RES FROM t1 AS t1_outer WHERE 
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
RES
DROP TABLE t1;
#
# Bug#18144: Cost with FORCE/USE index seems incorrect in some cases.
#
# We are interested in showing that the cost for the last plan is higher
# than for the preceding two plans.
#
CREATE TABLE t1( a INT, b INT, KEY( a ) );
INSERT INTO t1 values (1, 2), (1, 3), (2, 3), (2, 4), (3, 4), (3, 5);
EXPLAIN SELECT a, SUM( b ) FROM t1 GROUP BY a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary; Using filesort
SHOW STATUS LIKE 'Last_query_cost';
Variable_name	Value
Last_query_cost	0.014784
EXPLAIN SELECT a, SUM( b ) FROM t1 USE INDEX( a ) GROUP BY a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary; Using filesort
SHOW STATUS LIKE 'Last_query_cost';
Variable_name	Value
Last_query_cost	0.014784
EXPLAIN SELECT a, SUM( b ) FROM t1 FORCE INDEX( a ) GROUP BY a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	a	5	NULL	6	
SHOW STATUS LIKE 'Last_query_cost';
Variable_name	Value
Last_query_cost	0.014784
DROP TABLE t1;
#
# MDEV-21480: Unique key using ref access though eq_ref access can be used
#
create table t1(a int, b int,c int,  primary key(a), unique key(b,c));
insert into t1 select seq, seq, seq from seq_1_to_10;
create table t2(a int, b int,c int);
insert into t2 select seq, seq, seq+1 from seq_1_to_100;
EXPLAIN SELECT t1.c, t2.c FROM t1, t2 WHERE t1.b=t2.a and t1.c=t2.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	100	Using where
1	SIMPLE	t1	eq_ref	b	b	10	test.t2.a,test.t2.b	1	Using index
SELECT t1.c, t2.c FROM t1, t2 WHERE t1.b=t2.a and t1.c=t2.b;
c	c
1	2
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
10	11
alter table t1 drop PRIMARY KEY;
alter table t1 add PRIMARY KEY(b,c);
EXPLAIN SELECT t1.c, t2.c FROM t1, t2 WHERE t1.b=t2.a and t1.c=t2.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	100	Using where
1	SIMPLE	t1	eq_ref	PRIMARY,b	PRIMARY	8	test.t2.a,test.t2.b	1	Using index
SELECT t1.c, t2.c FROM t1, t2 WHERE t1.b=t2.a and t1.c=t2.b;
c	c
1	2
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
10	11
drop table t1,t2;
#
# MDEV-13756 Implement descending index: KEY (a DESC, b ASC)
#
create table t1 (a int, b int, key(a), key(a desc));
drop table t1;
# Check some issues with FORCE INDEX and full index scans
# (Does FORCE INDEX force an index scan)
#
create table t1 (a int primary key, b int, c int, d int,
key k1 (b) using BTREE, key k2 (c,d) using btree) engine=heap;
insert into t1 select seq as a, seq as b, seq as c, seq as d
from seq_1_to_100;
explain select sum(a+b) from t1 force index (k1) where b>0 and a=99;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	k1	k1	5	NULL	100	Using where
explain select sum(a+b) from t1 force index (k1) where a>0;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	100	Using where
explain select sum(a+b) from t1 force index (k1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	100	
explain select sum(a+b) from t1 force index for join (k1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	100	
explain select sum(a+b) from t1 force index for order by (k1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	100	
explain select sum(a+b) from t1 force index (k1,k2);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	100	
select sum(a+b) from t1 force index (k1);
sum(a+b)
10100
explain select sum(a+b) from t1 force index (primary);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	100	
select sum(a+b) from t1 force index (primary);
sum(a+b)
10100
explain select straight_join sum(a+b) from seq_1_to_10 as s, t1 force index (k2) where t1.a=s.seq;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	s	index	PRIMARY	PRIMARY	8	NULL	10	Using index
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	100	Using where; Using join buffer (flat, BNL join)
drop table t1;