439 lines
14 KiB
Plaintext
439 lines
14 KiB
Plaintext
SET SQL_WARNINGS=1;
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CREATE TABLE t1 (
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a tinytext NOT NULL,
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b tinyint(3) unsigned NOT NULL default '0',
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PRIMARY KEY (a(32),b)
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) ENGINE=MyISAM;
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Warnings:
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Warning 1681 Integer display width is deprecated and will be removed in a future release.
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INSERT INTO t1 VALUES ('a',1),('a',2);
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SELECT * FROM t1 WHERE a='a' AND b=2;
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a b
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a 2
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SELECT * FROM t1 WHERE a='a' AND b in (2);
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a b
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a 2
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SELECT * FROM t1 WHERE a='a' AND b in (1,2);
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a b
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a 1
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a 2
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drop table t1;
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CREATE TABLE t1 (c CHAR(10) NOT NULL,i INT NOT NULL AUTO_INCREMENT,
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UNIQUE (c,i)) ENGINE=MYISAM;
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INSERT IGNORE INTO t1 (c) VALUES (NULL),(NULL);
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Warnings:
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Warning 1048 Column 'c' cannot be null
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SELECT * FROM t1;
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c i
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1
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2
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INSERT INTO t1 (c) VALUES ('a'),('a');
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SELECT * FROM t1;
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c i
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1
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2
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a 1
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a 2
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DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (c CHAR(10) NULL, i INT NOT NULL AUTO_INCREMENT,
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UNIQUE (c,i)) ENGINE=MYISAM;
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INSERT INTO t1 (c) VALUES (NULL),(NULL);
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SELECT * FROM t1;
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c i
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NULL 1
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NULL 2
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INSERT INTO t1 (c) VALUES ('a'),('a');
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SELECT * FROM t1;
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c i
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NULL 1
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NULL 2
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a 1
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a 2
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drop table t1;
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CREATE TABLE t1 (id int unsigned auto_increment, name char(50), primary key (id)) engine=myisam;
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insert into t1 (name) values ('a'), ('b'),('c'),('d'),('e'),('f'),('g');
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explain select 1 from t1 where id =2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL const PRIMARY PRIMARY 4 const 1 100.00 Using index
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Warnings:
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Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` where true
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explain select 1 from t1 where id =2 or id=3;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL range PRIMARY PRIMARY 4 NULL 2 100.00 Using where; Using index
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Warnings:
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Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` where ((`test`.`t1`.`id` = 2) or (`test`.`t1`.`id` = 3))
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explain select name from t1 where id =2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL const PRIMARY PRIMARY 4 const 1 100.00 NULL
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Warnings:
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Note 1003 /* select#1 */ select 'b' AS `name` from `test`.`t1` where true
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ALTER TABLE t1 DROP PRIMARY KEY, ADD INDEX (id);
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explain select 1 from t1 where id =2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ref id id 4 const 1 100.00 Using index
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Warnings:
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Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` where (`test`.`t1`.`id` = 2)
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drop table t1;
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create table t1 (c varchar(30), t text, unique (c(2)), unique (t(3))) charset utf8 engine=myisam;
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Warnings:
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Warning 3719 'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`c` varchar(30) DEFAULT NULL,
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`t` text,
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UNIQUE KEY `c` (`c`(2)),
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UNIQUE KEY `t` (`t`(3))
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) ENGINE=MyISAM DEFAULT CHARSET=utf8
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insert t1 values ('cccc', 'tttt'),
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(0xD0B1212223D0B1D0B1D0B1D0B1D0B1, 0xD0B1D0B1212223D0B1D0B1D0B1D0B1),
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(0xD0B1222123D0B1D0B1D0B1D0B1D0B1, 0xD0B1D0B1222123D0B1D0B1D0B1D0B1);
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insert t1 (c) values ('cc22');
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ERROR 23000: Duplicate entry 'cc' for key 'c'
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insert t1 (t) values ('ttt22');
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ERROR 23000: Duplicate entry 'ttt' for key 't'
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insert t1 (c) values (0xD0B1212322D0B1D0B1D0B1D0B1D0B1);
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ERROR 23000: Duplicate entry 'б!' for key 'c'
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insert t1 (t) values (0xD0B1D0B1212322D0B1D0B1D0B1D0B1);
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ERROR 23000: Duplicate entry 'бб!' for key 't'
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select c from t1 where c='cccc';
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c
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cccc
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select t from t1 where t='tttt';
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t
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tttt
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select c from t1 where c=0xD0B1212223D0B1D0B1D0B1D0B1D0B1;
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c
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б!"#ббббб
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select t from t1 where t=0xD0B1D0B1212223D0B1D0B1D0B1D0B1;
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t
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бб!"#бббб
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drop table t1;
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DROP TABLE IF EXISTS t1;
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Warnings:
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Note 1051 Unknown table 'test.t1'
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CREATE TABLE t1 (
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c1 int,
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c2 varbinary(240),
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UNIQUE KEY (c1),
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KEY (c2)
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) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (1,'\Z\Z\Z\Z');
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INSERT INTO t1 VALUES (2,'\Z\Z\Z\Z\Z\Z');
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INSERT INTO t1 VALUES (3,'\Z\Z\Z\Z');
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select c1 from t1 where c2='\Z\Z\Z\Z';
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c1
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1
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3
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DELETE FROM t1 WHERE (c1 = 1);
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check table t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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select c1 from t1 where c2='\Z\Z\Z\Z';
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c1
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3
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DELETE FROM t1 WHERE (c1 = 3);
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check table t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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select c1 from t1 where c2='\Z\Z\Z\Z';
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c1
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truncate table t1;
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insert into t1 values(1,"aaaa"),(2,"aaab"),(3,"aaac"),(4,"aaccc");
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delete from t1 where c1=3;
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delete from t1 where c1=1;
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delete from t1 where c1=4;
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check table t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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drop table t1;
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create table t1 (
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c1 int,
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c2 varchar(20) not null,
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primary key (c1),
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key (c2(10))
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) engine=myisam;
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insert into t1 values (1,'');
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insert into t1 values (2,' \t\tTest String');
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insert into t1 values (3,' \n\tTest String');
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update t1 set c2 = 'New Test String' where c1 = 1;
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select * from t1;
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c1 c2
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1 New Test String
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2 Test String
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3
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Test String
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drop table t1;
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CREATE TABLE t1( a TINYINT, KEY(a) ) ENGINE=MyISAM;
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INSERT INTO t1 VALUES( 1 );
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ALTER TABLE t1 DISABLE KEYS;
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EXPLAIN SELECT MAX(a) FROM t1 FORCE INDEX(a);
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL system NULL NULL NULL NULL 1 100.00 NULL
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Warnings:
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Note 1003 /* select#1 */ select max('1') AS `MAX(a)` from dual
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drop table t1;
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CREATE TABLE t1 (a INT, b INT, INDEX (a,b)) engine=myisam;
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INSERT INTO t1 (a, b)
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VALUES
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(1,1), (1,2), (1,3), (1,4), (1,5),
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(2,2), (2,3), (2,1), (3,1), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6),
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(5,1), (5,2), (5,3), (5,4), (5,5);
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EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE
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(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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2 SUBQUERY t1 NULL range a a 5 NULL 11 100.00 Using index for group-by
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Warnings:
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Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` `t1_outer` where false
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SELECT 1 as RES FROM t1 AS t1_outer WHERE
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(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
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RES
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DROP TABLE t1;
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#
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# Bug#18144: Cost with FORCE/USE index seems incorrect in some cases.
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#
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# We are interested in showing that the cost for the last plan is higher
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# than for the preceding two plans.
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#
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CREATE TABLE t1( a INT, b INT, KEY( a ) ) engine=myisam;
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INSERT INTO t1 values (1, 2), (1, 3), (2, 3), (2, 4), (3, 4), (3, 5);
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EXPLAIN SELECT a, SUM( b ) FROM t1 GROUP BY a;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL index a a 5 NULL 6 100.00 NULL
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,sum(`test`.`t1`.`b`) AS `SUM( b )` from `test`.`t1` group by `test`.`t1`.`a`
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SHOW STATUS LIKE 'Last_query_cost';
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Variable_name Value
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Last_query_cost 1.102296
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EXPLAIN SELECT a, SUM( b ) FROM t1 USE INDEX( a ) GROUP BY a;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL index a a 5 NULL 6 100.00 NULL
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,sum(`test`.`t1`.`b`) AS `SUM( b )` from `test`.`t1` USE INDEX (`a`) group by `test`.`t1`.`a`
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SHOW STATUS LIKE 'Last_query_cost';
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Variable_name Value
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Last_query_cost 1.102296
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EXPLAIN SELECT a, SUM( b ) FROM t1 FORCE INDEX( a ) GROUP BY a;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL index a a 5 NULL 6 100.00 NULL
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,sum(`test`.`t1`.`b`) AS `SUM( b )` from `test`.`t1` FORCE INDEX (`a`) group by `test`.`t1`.`a`
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SHOW STATUS LIKE 'Last_query_cost';
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Variable_name Value
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Last_query_cost 2.349000
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DROP TABLE t1;
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#
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# Additional coverage for handling of key algorithm in index definition.
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#
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#
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# 1) Default case. If key algorithm was not specified explicitly and
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# this is normal key (not spatial or fulltext) storage engine
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# default key algorithm is used.
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#
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create table tm (k int, index (k)) charset utf8mb4 engine=myisam;
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#
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# Key algorithm is not shown in SHOW CREATE TABLE output in this case
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#
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show create table tm;
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Table Create Table
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tm CREATE TABLE `tm` (
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`k` int(11) DEFAULT NULL,
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KEY `k` (`k`)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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#
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# But visible in I_S.STATISTICS
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#
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select table_name, index_type from information_schema.statistics
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where table_schema = 'test' and table_name ='tm' order by table_name;
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TABLE_NAME INDEX_TYPE
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tm BTREE
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#
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# Same applies when keys are added by ALTER TABLE
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#
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alter table tm add column l int, add index (l);
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show create table tm;
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Table Create Table
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tm CREATE TABLE `tm` (
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`k` int(11) DEFAULT NULL,
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`l` int(11) DEFAULT NULL,
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KEY `k` (`k`),
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KEY `l` (`l`)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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select table_name, index_type from information_schema.statistics
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where table_schema = 'test' and table_name = 'tm' and index_name = 'l'
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order by table_name;
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TABLE_NAME INDEX_TYPE
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tm BTREE
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drop tables tm;
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#
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# 2) For SPATIAL and FULLTEXT keys we always use special key
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# algorithms and there is no way to specify it explicitly.
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#
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create table tm (pk int primary key, p point not null SRID 0, spatial index (p))
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charset utf8mb4 engine=myisam;
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#
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# Key algorithm is not shown in SHOW CREATE TABLE output in this
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# case as well.
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#
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show create table tm;
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Table Create Table
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tm CREATE TABLE `tm` (
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`pk` int(11) NOT NULL,
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`p` point NOT NULL /*!80003 SRID 0 */,
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PRIMARY KEY (`pk`),
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SPATIAL KEY `p` (`p`)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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#
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# But visible in I_S.STATISTICS
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#
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select table_name, index_type from information_schema.statistics
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where table_schema = 'test' and table_name = 'tm' and index_name = 'p'
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order by table_name;
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TABLE_NAME INDEX_TYPE
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tm SPATIAL
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#
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# Same applies when keys are added by ALTER TABLE
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#
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alter table tm add column q point not null SRID 0, add spatial index (q);
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select table_name, index_type from information_schema.statistics
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where table_schema = 'test' and table_name = 'tm' and index_name = 'q'
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order by table_name;
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TABLE_NAME INDEX_TYPE
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tm SPATIAL
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drop tables tm;
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#
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# Same applies to FULLTEXT indexes.
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#
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create table tm (pk int primary key, v varchar(255), fulltext index (v))
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charset utf8mb4 engine=myisam;
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show create table tm;
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Table Create Table
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tm CREATE TABLE `tm` (
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`pk` int(11) NOT NULL,
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`v` varchar(255) DEFAULT NULL,
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PRIMARY KEY (`pk`),
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FULLTEXT KEY `v` (`v`)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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select table_name, index_type from information_schema.statistics
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where table_schema = 'test' and table_name = 'tm' and index_name = 'v'
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order by table_name;
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TABLE_NAME INDEX_TYPE
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tm FULLTEXT
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#
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# Same applies when keys are added by ALTER TABLE
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#
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alter table tm add column w varchar(255), add fulltext index (w);
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show create table tm;
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Table Create Table
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tm CREATE TABLE `tm` (
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`pk` int(11) NOT NULL,
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`v` varchar(255) DEFAULT NULL,
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`w` varchar(255) DEFAULT NULL,
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PRIMARY KEY (`pk`),
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FULLTEXT KEY `v` (`v`),
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FULLTEXT KEY `w` (`w`)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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select table_name, index_type from information_schema.statistics
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where table_schema = 'test' and table_name = 'tm' and index_name = 'w'
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order by table_name;
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TABLE_NAME INDEX_TYPE
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tm FULLTEXT
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drop tables tm;
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#
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# 3) If key algorithm was specified explicitly and it is supported
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# by the storage engine it will be used.
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#
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create table tm (k int, index using btree (k)) charset utf8mb4 engine=myisam;
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#
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# In this case it is shown in SHOW CREATE TABLE output
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#
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show create table tm;
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Table Create Table
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tm CREATE TABLE `tm` (
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`k` int(11) DEFAULT NULL,
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KEY `k` (`k`) USING BTREE
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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#
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# Also visible in I_S.STATISTICS
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#
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select table_name, index_type from information_schema.statistics
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where table_schema = 'test' and table_name = 'tm' order by table_name;
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TABLE_NAME INDEX_TYPE
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tm BTREE
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#
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# Same applies when keys are added by ALTER TABLE
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#
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# Note that the information that algorithm was provided explicitly is
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# preserved by ALTER TABLE.
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alter table tm add column l int, add index using btree (l);
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show create table tm;
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Table Create Table
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tm CREATE TABLE `tm` (
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`k` int(11) DEFAULT NULL,
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`l` int(11) DEFAULT NULL,
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KEY `k` (`k`) USING BTREE,
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KEY `l` (`l`) USING BTREE
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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select table_name, index_type from information_schema.statistics
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where table_schema = 'test' and table_name = 'tm' and index_name = 'l'
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order by table_name;
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TABLE_NAME INDEX_TYPE
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tm BTREE
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drop tables tm;
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#
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# 7) Key algorithm and ALTER TABLE ALGORITHM=INPLACE
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#
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# Changing key algorithm from one used by default to the same one
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# but specified explicitly should be inplace/fast operation.
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create table t1 (k int, index (k)) charset utf8mb4 engine=myisam;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`k` int(11) DEFAULT NULL,
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KEY `k` (`k`)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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alter table t1 drop key k, add index using btree (k), algorithm=inplace;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`k` int(11) DEFAULT NULL,
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KEY `k` (`k`) USING BTREE
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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alter table t1 drop key k, add index (k), algorithm=inplace;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`k` int(11) DEFAULT NULL,
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KEY `k` (`k`)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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# Note that below statement doesn't really change algorithm.
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alter table t1 drop key k, add index using hash (k), algorithm=inplace;
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Warnings:
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Note 3502 This storage engine does not support the HASH index algorithm, storage engine default was used instead.
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drop table t1;
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# Changing key algorithm to another one can require COPY algorithm.
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create table t1 (k int, index (k)) charset utf8mb4 engine=heap;
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`k` int(11) DEFAULT NULL,
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KEY `k` (`k`)
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) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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alter table t1 drop key k, add index using btree (k), algorithm=inplace;
|
||
ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY.
|
||
show create table t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`k` int(11) DEFAULT NULL,
|
||
KEY `k` (`k`)
|
||
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
|
||
alter table t1 drop key k, add index using btree (k), algorithm=copy;
|
||
show create table t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`k` int(11) DEFAULT NULL,
|
||
KEY `k` (`k`) USING BTREE
|
||
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
|
||
drop table t1;
|