mirror of
https://github.com/MariaDB/server.git
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340 lines
12 KiB
Plaintext
340 lines
12 KiB
Plaintext
drop table if exists t1,t2;
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create table t1 (
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c_id int(11) not null default '0',
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org_id int(11) default null,
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unique key contacts$c_id (c_id),
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key contacts$org_id (org_id)
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) engine=innodb;
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insert into t1 values
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(2,null),(120,null),(141,null),(218,7), (128,1),
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(151,2),(234,2),(236,2),(243,2),(255,2),(259,2),(232,3),(235,3),(238,3),
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(246,3),(253,3),(269,3),(285,3),(291,3),(293,3),(131,4),(230,4),(231,4);
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create table t2 (
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slai_id int(11) not null default '0',
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owner_tbl int(11) default null,
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owner_id int(11) default null,
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sla_id int(11) default null,
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inc_web int(11) default null,
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inc_email int(11) default null,
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inc_chat int(11) default null,
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inc_csr int(11) default null,
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inc_total int(11) default null,
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time_billed int(11) default null,
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activedate timestamp null default null,
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expiredate timestamp null default null,
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state int(11) default null,
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sla_set int(11) default null,
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unique key t2$slai_id (slai_id),
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key t2$owner_id (owner_id),
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key t2$sla_id (sla_id)
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) engine=innodb;
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insert into t2(slai_id, owner_tbl, owner_id, sla_id) values
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(1,3,1,1), (3,3,10,2), (4,3,3,6), (5,3,2,5), (6,3,8,3), (7,3,9,7),
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(8,3,6,8), (9,3,4,9), (10,3,5,10), (11,3,11,11), (12,3,7,12);
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flush tables;
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select si.slai_id
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from t1 c join t2 si on
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((si.owner_tbl = 3 and si.owner_id = c.org_id) or
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( si.owner_tbl = 2 and si.owner_id = c.c_id))
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where
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c.c_id = 218 and expiredate is null;
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slai_id
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12
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select * from t1 where org_id is null;
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c_id org_id
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2 NULL
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120 NULL
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141 NULL
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select si.slai_id
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from t1 c join t2 si on
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((si.owner_tbl = 3 and si.owner_id = c.org_id) or
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( si.owner_tbl = 2 and si.owner_id = c.c_id))
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where
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c.c_id = 218 and expiredate is null;
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slai_id
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12
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drop table t1, t2;
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CREATE TABLE t1 (a int, b int, KEY b (b)) Engine=InnoDB;
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CREATE TABLE t2 (a int, b int, PRIMARY KEY (a,b)) Engine=InnoDB;
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CREATE TABLE t3 (a int, b int, c int, PRIMARY KEY (a),
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UNIQUE KEY b (b,c), KEY a (a,b,c)) Engine=InnoDB;
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INSERT INTO t1 VALUES (1, 1);
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INSERT INTO t1 SELECT a + 1, b + 1 FROM t1;
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INSERT INTO t1 SELECT a + 2, b + 2 FROM t1;
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INSERT INTO t2 VALUES (1,1),(1,2),(1,3),(1,4),(1,5),(1,6),(1,7),(1,8);
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INSERT INTO t2 SELECT a + 1, b FROM t2;
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DELETE FROM t2 WHERE a = 1 AND b < 2;
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INSERT INTO t3 VALUES (1,1,1),(2,1,2);
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INSERT INTO t3 SELECT a + 2, a + 2, 3 FROM t3;
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INSERT INTO t3 SELECT a + 4, a + 4, 3 FROM t3;
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SELECT STRAIGHT_JOIN SQL_NO_CACHE t1.b, t1.a FROM t1, t3, t2 WHERE
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t3.a = t2.a AND t2.b = t1.a AND t3.b = 1 AND t3.c IN (1, 2)
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ORDER BY t1.b LIMIT 2;
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b a
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1 1
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2 2
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SELECT STRAIGHT_JOIN SQL_NO_CACHE t1.b, t1.a FROM t1, t3, t2 WHERE
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t3.a = t2.a AND t2.b = t1.a AND t3.b = 1 AND t3.c IN (1, 2)
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ORDER BY t1.b LIMIT 5;
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b a
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1 1
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2 2
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2 2
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3 3
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3 3
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DROP TABLE t1, t2, t3;
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CREATE TABLE `t1` (`id1` INT) ;
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INSERT INTO `t1` (`id1`) VALUES (1),(5),(2);
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CREATE TABLE `t2` (
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`id1` INT,
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`id2` INT NOT NULL,
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`id3` INT,
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`id4` INT NOT NULL,
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UNIQUE (`id2`,`id4`),
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KEY (`id1`)
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) ENGINE=InnoDB;
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INSERT INTO `t2`(`id1`,`id2`,`id3`,`id4`) VALUES
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(1,1,1,0),
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(1,1,2,1),
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(5,1,2,2),
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(6,1,2,3),
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(1,2,2,2),
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(1,2,1,1);
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SELECT `id1` FROM `t1` WHERE `id1` NOT IN (SELECT `id1` FROM `t2` WHERE `id2` = 1 AND `id3` = 2);
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id1
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2
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DROP TABLE t1, t2;
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create table t1m (a int) engine=myisam;
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create table t1i (a int) engine=innodb;
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create table t2m (a int) engine=myisam;
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create table t2i (a int) engine=innodb;
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insert into t2m values (5);
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insert into t2i values (5);
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select min(a) from t1m;
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min(a)
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NULL
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select min(7) from t1m;
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min(7)
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NULL
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select min(7) from DUAL;
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min(7)
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7
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explain select min(7) from t2m join t1m;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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select min(7) from t2m join t1m;
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min(7)
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NULL
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select max(a) from t1m;
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max(a)
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NULL
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select max(7) from t1m;
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max(7)
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NULL
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select max(7) from DUAL;
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max(7)
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7
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explain select max(7) from t2m join t1m;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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select max(7) from t2m join t1m;
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max(7)
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NULL
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select 1, min(a) from t1m where a=99;
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1 min(a)
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1 NULL
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select 1, min(a) from t1m where 1=99;
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1 min(a)
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1 NULL
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select 1, min(1) from t1m where a=99;
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1 min(1)
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1 NULL
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select 1, min(1) from t1m where 1=99;
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1 min(1)
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1 NULL
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select 1, max(a) from t1m where a=99;
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1 max(a)
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1 NULL
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select 1, max(a) from t1m where 1=99;
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1 max(a)
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1 NULL
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select 1, max(1) from t1m where a=99;
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1 max(1)
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1 NULL
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select 1, max(1) from t1m where 1=99;
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1 max(1)
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1 NULL
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select min(a) from t1i;
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min(a)
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NULL
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select min(7) from t1i;
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min(7)
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NULL
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select min(7) from DUAL;
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min(7)
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7
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explain select min(7) from t2i join t1i;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2i ALL NULL NULL NULL NULL 1
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1 SIMPLE t1i ALL NULL NULL NULL NULL 1
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select min(7) from t2i join t1i;
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min(7)
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NULL
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select max(a) from t1i;
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max(a)
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NULL
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select max(7) from t1i;
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max(7)
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NULL
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select max(7) from DUAL;
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max(7)
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7
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explain select max(7) from t2i join t1i;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2i ALL NULL NULL NULL NULL 1
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1 SIMPLE t1i ALL NULL NULL NULL NULL 1
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select max(7) from t2i join t1i;
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max(7)
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NULL
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select 1, min(a) from t1i where a=99;
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1 min(a)
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1 NULL
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select 1, min(a) from t1i where 1=99;
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1 min(a)
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1 NULL
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select 1, min(1) from t1i where a=99;
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1 min(1)
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1 NULL
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select 1, min(1) from t1i where 1=99;
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1 min(1)
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1 NULL
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select 1, max(a) from t1i where a=99;
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1 max(a)
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1 NULL
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select 1, max(a) from t1i where 1=99;
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1 max(a)
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1 NULL
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select 1, max(1) from t1i where a=99;
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1 max(1)
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1 NULL
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select 1, max(1) from t1i where 1=99;
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1 max(1)
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1 NULL
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explain select count(*), min(7), max(7) from t1m, t1i;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1m system NULL NULL NULL NULL 0 const row not found
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1 SIMPLE t1i ALL NULL NULL NULL NULL 1
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select count(*), min(7), max(7) from t1m, t1i;
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count(*) min(7) max(7)
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0 NULL NULL
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explain select count(*), min(7), max(7) from t1m, t2i;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1m system NULL NULL NULL NULL 0 const row not found
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1 SIMPLE t2i ALL NULL NULL NULL NULL 1
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select count(*), min(7), max(7) from t1m, t2i;
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count(*) min(7) max(7)
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0 NULL NULL
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explain select count(*), min(7), max(7) from t2m, t1i;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2m system NULL NULL NULL NULL 1
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1 SIMPLE t1i ALL NULL NULL NULL NULL 1
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select count(*), min(7), max(7) from t2m, t1i;
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count(*) min(7) max(7)
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0 NULL NULL
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drop table t1m, t1i, t2m, t2i;
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create table t1 (
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a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(64) default ' '
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);
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insert into t1 (a1, a2, b, c, d) values
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('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
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('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
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('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
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('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
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('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
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('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
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('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
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('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
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('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
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('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
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('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
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('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
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('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
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('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
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('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
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('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'),
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('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
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('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
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('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
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('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
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('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
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('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
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('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
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('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
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('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
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('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
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('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
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('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
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('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
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('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
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('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
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('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4');
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create table t4 (
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pk_col int auto_increment primary key, a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(64) default ' '
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) engine=innodb;
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insert into t4 (a1, a2, b, c, d, dummy) select * from t1;
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create index idx12672_0 on t4 (a1);
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create index idx12672_1 on t4 (a1,a2,b,c);
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create index idx12672_2 on t4 (a1,a2,b);
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analyze table t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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select distinct a1 from t4 where pk_col not in (1,2,3,4);
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a1
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a
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b
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c
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d
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drop table t1,t4;
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create table t1 (
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a varchar(30), b varchar(30), primary key(a), key(b)
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) engine=innodb;
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select distinct a from t1;
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a
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drop table t1;
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create table t1(a int, key(a)) engine=innodb;
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insert into t1 values(1);
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select a, count(a) from t1 group by a with rollup;
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a count(a)
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1 1
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NULL 1
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drop table t1;
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create table t1 (f1 int, f2 char(1), primary key(f1,f2)) engine=innodb;
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insert into t1 values ( 1,"e"),(2,"a"),( 3,"c"),(4,"d");
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alter table t1 drop primary key, add primary key (f2, f1);
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explain select distinct f1 a, f1 b from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL PRIMARY 5 NULL 4 Using index; Using temporary
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explain select distinct f1, f2 from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range NULL PRIMARY 5 NULL 3 Using index for group-by; Using temporary
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drop table t1;
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CREATE TABLE t1 (id int(11) NOT NULL PRIMARY KEY, name varchar(20),
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INDEX (name)) ENGINE=InnoDB;
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CREATE TABLE t2 (id int(11) NOT NULL PRIMARY KEY, fkey int(11),
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FOREIGN KEY (fkey) REFERENCES t2(id)) ENGINE=InnoDB;
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INSERT INTO t1 VALUES (1,'A1'),(2,'A2'),(3,'B');
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INSERT INTO t2 VALUES (1,1),(2,2),(3,2),(4,3),(5,3);
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EXPLAIN
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SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id
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WHERE t1.name LIKE 'A%';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY,name name 23 NULL 3 Using where; Using index
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1 SIMPLE t2 ref fkey fkey 5 test.t1.id 1 Using where; Using index
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EXPLAIN
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SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id
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WHERE t1.name LIKE 'A%' OR FALSE;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 index NULL fkey 5 NULL 5 Using index
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1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.fkey 1 Using where
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DROP TABLE t1,t2;
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