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1
by brian
clean slate |
1 |
drop table if exists t0,t1,t2,t3,t4,t5;
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CREATE TABLE t1 (
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grp int(11) default NULL,
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a bigint(20) unsigned default NULL,
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c char(10) NOT NULL default ''
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) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (1,1,'a'),(2,2,'b'),(2,3,'c'),(3,4,'E'),(3,5,'C'),(3,6,'D'),(NULL,NULL,'');
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create table t2 (id int, a bigint unsigned not null, c char(10), d int, primary key (a));
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insert into t2 values (1,1,"a",1),(3,4,"A",4),(3,5,"B",5),(3,6,"C",6),(4,7,"D",7);
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select t1.*,t2.* from t1 JOIN t2 where t1.a=t2.a;
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11 |
grp a c id a c d
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1 1 a 1 1 a 1
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3 4 E 3 4 A 4
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3 5 C 3 5 B 5
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3 6 D 3 6 C 6
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select t1.*,t2.* from t1 left join t2 on (t1.a=t2.a) order by t1.grp,t1.a,t2.c;
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grp a c id a c d
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NULL NULL NULL NULL NULL NULL
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1 1 a 1 1 a 1
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2 2 b NULL NULL NULL NULL
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2 3 c NULL NULL NULL NULL
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3 4 E 3 4 A 4
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3 5 C 3 5 B 5
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3 6 D 3 6 C 6
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select t1.*,t2.* from { oj t2 left outer join t1 on (t1.a=t2.a) };
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grp a c id a c d
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1 1 a 1 1 a 1
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28 |
3 4 E 3 4 A 4
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3 5 C 3 5 B 5
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30 |
3 6 D 3 6 C 6
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NULL NULL NULL 4 7 D 7
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select t1.*,t2.* from t1 as t0,{ oj t2 left outer join t1 on (t1.a=t2.a) } WHERE t0.a=2;
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grp a c id a c d
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1 1 a 1 1 a 1
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35 |
3 4 E 3 4 A 4
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3 5 C 3 5 B 5
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3 6 D 3 6 C 6
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NULL NULL NULL 4 7 D 7
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select t1.*,t2.* from t1 left join t2 using (a);
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grp a c id a c d
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1 1 a 1 1 a 1
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2 2 b NULL NULL NULL NULL
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2 3 c NULL NULL NULL NULL
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3 4 E 3 4 A 4
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3 5 C 3 5 B 5
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3 6 D 3 6 C 6
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NULL NULL NULL NULL NULL NULL
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select t1.*,t2.* from t1 left join t2 using (a) where t1.a=t2.a;
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49 |
grp a c id a c d
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1 1 a 1 1 a 1
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3 4 E 3 4 A 4
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3 5 C 3 5 B 5
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3 6 D 3 6 C 6
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select t1.*,t2.* from t1 left join t2 using (a,c);
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grp a c id a c d
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1 1 a 1 1 a 1
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2 2 b NULL NULL NULL NULL
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2 3 c NULL NULL NULL NULL
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3 4 E NULL NULL NULL NULL
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3 5 C NULL NULL NULL NULL
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3 6 D NULL NULL NULL NULL
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NULL NULL NULL NULL NULL NULL
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select t1.*,t2.* from t1 left join t2 using (c);
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grp a c id a c d
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1 1 a 1 1 a 1
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1 1 a 3 4 A 4
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2 2 b 3 5 B 5
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2 3 c 3 6 C 6
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3 4 E NULL NULL NULL NULL
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3 5 C 3 6 C 6
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3 6 D 4 7 D 7
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NULL NULL NULL NULL NULL NULL
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select t1.*,t2.* from t1 natural left outer join t2;
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grp a c id a c d
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1 1 a 1 1 a 1
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2 2 b NULL NULL NULL NULL
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2 3 c NULL NULL NULL NULL
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3 4 E NULL NULL NULL NULL
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3 5 C NULL NULL NULL NULL
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3 6 D NULL NULL NULL NULL
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NULL NULL NULL NULL NULL NULL
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select t1.*,t2.* from t1 left join t2 on (t1.a=t2.a) where t2.id=3;
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grp a c id a c d
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3 4 E 3 4 A 4
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3 5 C 3 5 B 5
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3 6 D 3 6 C 6
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select t1.*,t2.* from t1 left join t2 on (t1.a=t2.a) where t2.id is null;
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grp a c id a c d
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2 2 b NULL NULL NULL NULL
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2 3 c NULL NULL NULL NULL
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NULL NULL NULL NULL NULL NULL
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explain select t1.*,t2.* from t1,t2 where t1.a=t2.a and isnull(t2.a)=1;
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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 Impossible WHERE
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explain select t1.*,t2.* from t1 left join t2 on t1.a=t2.a where isnull(t2.a)=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 7
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1 SIMPLE t2 eq_ref PRIMARY PRIMARY 8 test.t1.a 1 Using where
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select t1.*,t2.*,t3.a from t1 left join t2 on (t1.a=t2.a) left join t1 as t3 on (t2.a=t3.a);
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grp a c id a c d a
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1 1 a 1 1 a 1 1
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102 |
2 2 b NULL NULL NULL NULL NULL
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2 3 c NULL NULL NULL NULL NULL
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3 4 E 3 4 A 4 4
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3 5 C 3 5 B 5 5
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3 6 D 3 6 C 6 6
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NULL NULL NULL NULL NULL NULL NULL
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explain select t1.*,t2.*,t3.a from t1 left join t2 on (t3.a=t2.a) left join t1 as t3 on (t1.a=t3.a);
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ERROR 42S22: Unknown column 't3.a' in 'on clause'
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select t1.*,t2.*,t3.a from t1 left join t2 on (t3.a=t2.a) left join t1 as t3 on (t1.a=t3.a);
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ERROR 42S22: Unknown column 't3.a' in 'on clause'
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select t1.*,t2.*,t3.a from t1 left join t2 on (t3.a=t2.a) left join t1 as t3 on (t2.a=t3.a);
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ERROR 42S22: Unknown column 't3.a' in 'on clause'
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select t1.*,t2.* from t1 inner join t2 using (a);
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115 |
grp a c id a c d
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1 1 a 1 1 a 1
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117 |
3 4 E 3 4 A 4
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3 5 C 3 5 B 5
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3 6 D 3 6 C 6
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select t1.*,t2.* from t1 inner join t2 on (t1.a=t2.a);
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121 |
grp a c id a c d
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122 |
1 1 a 1 1 a 1
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3 4 E 3 4 A 4
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3 5 C 3 5 B 5
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3 6 D 3 6 C 6
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select t1.*,t2.* from t1 natural join t2;
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grp a c id a c d
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128 |
1 1 a 1 1 a 1
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129 |
drop table t1,t2;
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130 |
CREATE TABLE t1 (
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usr_id INT unsigned NOT NULL,
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132 |
uniq_id INT unsigned NOT NULL AUTO_INCREMENT,
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start_num INT unsigned NOT NULL DEFAULT 1,
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increment INT unsigned NOT NULL DEFAULT 1,
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PRIMARY KEY (uniq_id),
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INDEX usr_uniq_idx (usr_id, uniq_id),
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INDEX uniq_usr_idx (uniq_id, usr_id)
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);
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CREATE TABLE t2 (
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id INT unsigned NOT NULL DEFAULT 0,
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usr2_id INT unsigned NOT NULL DEFAULT 0,
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max INT unsigned NOT NULL DEFAULT 0,
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c_amount INT unsigned NOT NULL DEFAULT 0,
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d_max INT unsigned NOT NULL DEFAULT 0,
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d_num INT unsigned NOT NULL DEFAULT 0,
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146 |
orig_time INT unsigned NOT NULL DEFAULT 0,
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c_time INT unsigned NOT NULL DEFAULT 0,
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active ENUM ("no","yes") NOT NULL,
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PRIMARY KEY (id,usr2_id),
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INDEX id_idx (id),
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INDEX usr2_idx (usr2_id)
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);
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153 |
INSERT INTO t1 VALUES (3,NULL,0,50),(3,NULL,0,200),(3,NULL,0,25),(3,NULL,0,84676),(3,NULL,0,235),(3,NULL,0,10),(3,NULL,0,3098),(3,NULL,0,2947),(3,NULL,0,8987),(3,NULL,0,8347654),(3,NULL,0,20398),(3,NULL,0,8976),(3,NULL,0,500),(3,NULL,0,198);
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154 |
SELECT t1.usr_id,t1.uniq_id,t1.increment,
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t2.usr2_id,t2.c_amount,t2.max
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FROM t1
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LEFT JOIN t2 ON t2.id = t1.uniq_id
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WHERE t1.uniq_id = 4
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ORDER BY t2.c_amount;
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usr_id uniq_id increment usr2_id c_amount max
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3 4 84676 NULL NULL NULL
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162 |
SELECT t1.usr_id,t1.uniq_id,t1.increment,
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t2.usr2_id,t2.c_amount,t2.max
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FROM t2
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RIGHT JOIN t1 ON t2.id = t1.uniq_id
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WHERE t1.uniq_id = 4
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ORDER BY t2.c_amount;
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usr_id uniq_id increment usr2_id c_amount max
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3 4 84676 NULL NULL NULL
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INSERT INTO t2 VALUES (2,3,3000,6000,0,0,746584,837484,'yes');
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INSERT INTO t2 VALUES (2,3,3000,6000,0,0,746584,837484,'yes');
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172 |
ERROR 23000: Duplicate entry '2-3' for key 'PRIMARY'
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INSERT INTO t2 VALUES (7,3,1000,2000,0,0,746294,937484,'yes');
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174 |
SELECT t1.usr_id,t1.uniq_id,t1.increment,t2.usr2_id,t2.c_amount,t2.max FROM t1 LEFT JOIN t2 ON t2.id = t1.uniq_id WHERE t1.uniq_id = 4 ORDER BY t2.c_amount;
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usr_id uniq_id increment usr2_id c_amount max
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176 |
3 4 84676 NULL NULL NULL
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SELECT t1.usr_id,t1.uniq_id,t1.increment,t2.usr2_id,t2.c_amount,t2.max FROM t1 LEFT JOIN t2 ON t2.id = t1.uniq_id WHERE t1.uniq_id = 4 GROUP BY t2.c_amount;
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usr_id uniq_id increment usr2_id c_amount max
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179 |
3 4 84676 NULL NULL NULL
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180 |
SELECT t1.usr_id,t1.uniq_id,t1.increment,t2.usr2_id,t2.c_amount,t2.max FROM t1 LEFT JOIN t2 ON t2.id = t1.uniq_id WHERE t1.uniq_id = 4;
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usr_id uniq_id increment usr2_id c_amount max
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3 4 84676 NULL NULL NULL
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drop table t1,t2;
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184 |
CREATE TABLE t1 (
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cod_asig int(11) DEFAULT '0' NOT NULL,
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desc_larga_cat varchar(80) DEFAULT '' NOT NULL,
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desc_larga_cas varchar(80) DEFAULT '' NOT NULL,
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desc_corta_cat varchar(40) DEFAULT '' NOT NULL,
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desc_corta_cas varchar(40) DEFAULT '' NOT NULL,
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cred_total double(3,1) DEFAULT '0.0' NOT NULL,
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pre_requisit int(11),
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co_requisit int(11),
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preco_requisit int(11),
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PRIMARY KEY (cod_asig)
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);
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196 |
INSERT INTO t1 VALUES (10360,'asdfggfg','Introduccion a los Ordenadores I','asdfggfg','Introduccio Ordinadors I',6.0,NULL,NULL,NULL);
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197 |
INSERT INTO t1 VALUES (10361,'Components i Circuits Electronics I','Componentes y Circuitos Electronicos I','Components i Circuits Electronics I','Comp. i Circ. Electr. I',6.0,NULL,NULL,NULL);
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198 |
INSERT INTO t1 VALUES (10362,'Laboratori d`Ordinadors','Laboratorio de Ordenadores','Laboratori d`Ordinadors','Laboratori Ordinadors',4.5,NULL,NULL,NULL);
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199 |
INSERT INTO t1 VALUES (10363,'Tecniques de Comunicacio Oral i Escrita','Tecnicas de Comunicacion Oral y Escrita','Tecniques de Comunicacio Oral i Escrita','Tec. Com. Oral i Escrita',4.5,NULL,NULL,NULL);
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200 |
INSERT INTO t1 VALUES (11403,'Projecte Fi de Carrera','Proyecto Fin de Carrera','Projecte Fi de Carrera','PFC',9.0,NULL,NULL,NULL);
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201 |
INSERT INTO t1 VALUES (11404,'+lgebra lineal','Algebra lineal','+lgebra lineal','+lgebra lineal',15.0,NULL,NULL,NULL);
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202 |
INSERT INTO t1 VALUES (11405,'+lgebra lineal','Algebra lineal','+lgebra lineal','+lgebra lineal',18.0,NULL,NULL,NULL);
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203 |
INSERT INTO t1 VALUES (11406,'Calcul Infinitesimal','Cßlculo Infinitesimal','Calcul Infinitesimal','Calcul Infinitesimal',15.0,NULL,NULL,NULL);
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204 |
CREATE TABLE t2 (
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idAssignatura int(11) DEFAULT '0' NOT NULL,
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Grup int(11) DEFAULT '0' NOT NULL,
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Places smallint(6) DEFAULT '0' NOT NULL,
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208 |
PlacesOcupades int(11) DEFAULT '0',
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209 |
PRIMARY KEY (idAssignatura,Grup)
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);
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211 |
INSERT INTO t2 VALUES (10360,12,333,0);
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212 |
INSERT INTO t2 VALUES (10361,30,2,0);
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213 |
INSERT INTO t2 VALUES (10361,40,3,0);
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214 |
INSERT INTO t2 VALUES (10360,45,10,0);
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215 |
INSERT INTO t2 VALUES (10362,10,12,0);
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216 |
INSERT INTO t2 VALUES (10360,55,2,0);
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217 |
INSERT INTO t2 VALUES (10360,70,0,0);
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218 |
INSERT INTO t2 VALUES (10360,565656,0,0);
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219 |
INSERT INTO t2 VALUES (10360,32767,7,0);
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220 |
INSERT INTO t2 VALUES (10360,33,8,0);
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221 |
INSERT INTO t2 VALUES (10360,7887,85,0);
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222 |
INSERT INTO t2 VALUES (11405,88,8,0);
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223 |
INSERT INTO t2 VALUES (10360,0,55,0);
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224 |
INSERT INTO t2 VALUES (10360,99,0,0);
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225 |
INSERT INTO t2 VALUES (11411,30,10,0);
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226 |
INSERT INTO t2 VALUES (11404,0,0,0);
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227 |
INSERT INTO t2 VALUES (10362,11,111,0);
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228 |
INSERT INTO t2 VALUES (10363,33,333,0);
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229 |
INSERT INTO t2 VALUES (11412,55,0,0);
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230 |
INSERT INTO t2 VALUES (50003,66,6,0);
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231 |
INSERT INTO t2 VALUES (11403,5,0,0);
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232 |
INSERT INTO t2 VALUES (11406,11,11,0);
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233 |
INSERT INTO t2 VALUES (11410,11410,131,0);
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234 |
INSERT INTO t2 VALUES (11416,11416,32767,0);
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235 |
INSERT INTO t2 VALUES (11409,0,0,0);
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236 |
CREATE TABLE t3 (
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237 |
id int(11) NOT NULL auto_increment,
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238 |
dni_pasaporte char(16) DEFAULT '' NOT NULL,
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idPla int(11) DEFAULT '0' NOT NULL,
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240 |
cod_asig int(11) DEFAULT '0' NOT NULL,
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241 |
any smallint(6) DEFAULT '0' NOT NULL,
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242 |
quatrimestre smallint(6) DEFAULT '0' NOT NULL,
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243 |
estat char(1) DEFAULT 'M' NOT NULL,
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244 |
PRIMARY KEY (id),
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245 |
UNIQUE dni_pasaporte (dni_pasaporte,idPla),
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246 |
UNIQUE dni_pasaporte_2 (dni_pasaporte,idPla,cod_asig,any,quatrimestre)
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247 |
);
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248 |
INSERT INTO t3 VALUES (1,'11111111',1,10362,98,1,'M');
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249 |
CREATE TABLE t4 (
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250 |
id int(11) NOT NULL auto_increment,
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251 |
papa int(11) DEFAULT '0' NOT NULL,
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252 |
fill int(11) DEFAULT '0' NOT NULL,
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253 |
idPla int(11) DEFAULT '0' NOT NULL,
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254 |
PRIMARY KEY (id),
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255 |
KEY papa (idPla,papa),
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256 |
UNIQUE papa_2 (idPla,papa,fill)
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257 |
);
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258 |
INSERT INTO t4 VALUES (1,-1,10360,1);
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259 |
INSERT INTO t4 VALUES (2,-1,10361,1);
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260 |
INSERT INTO t4 VALUES (3,-1,10362,1);
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261 |
SELECT DISTINCT fill,desc_larga_cat,cred_total,Grup,Places,PlacesOcupades FROM t4 LEFT JOIN t3 ON t3.cod_asig=fill AND estat='S' AND dni_pasaporte='11111111' AND t3.idPla=1 , t2,t1 WHERE fill=t1.cod_asig AND Places>PlacesOcupades AND fill=idAssignatura AND t4.idPla=1 AND papa=-1;
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262 |
fill desc_larga_cat cred_total Grup Places PlacesOcupades
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263 |
10360 asdfggfg 6.0 0 55 0
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264 |
10360 asdfggfg 6.0 12 333 0
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265 |
10360 asdfggfg 6.0 33 8 0
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266 |
10360 asdfggfg 6.0 45 10 0
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267 |
10360 asdfggfg 6.0 55 2 0
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268 |
10360 asdfggfg 6.0 7887 85 0
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269 |
10360 asdfggfg 6.0 32767 7 0
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270 |
10361 Components i Circuits Electronics I 6.0 30 2 0
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271 |
10361 Components i Circuits Electronics I 6.0 40 3 0
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272 |
10362 Laboratori d`Ordinadors 4.5 10 12 0
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273 |
10362 Laboratori d`Ordinadors 4.5 11 111 0
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274 |
SELECT DISTINCT fill,t3.idPla FROM t4 LEFT JOIN t3 ON t3.cod_asig=t4.fill AND t3.estat='S' AND t3.dni_pasaporte='1234' AND t3.idPla=1 ;
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275 |
fill idPla
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276 |
10360 NULL
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277 |
10361 NULL
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278 |
10362 NULL
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279 |
INSERT INTO t3 VALUES (3,'1234',1,10360,98,1,'S');
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280 |
SELECT DISTINCT fill,t3.idPla FROM t4 LEFT JOIN t3 ON t3.cod_asig=t4.fill AND t3.estat='S' AND t3.dni_pasaporte='1234' AND t3.idPla=1 ;
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281 |
fill idPla
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282 |
10360 1
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283 |
10361 NULL
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284 |
10362 NULL
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285 |
drop table t1,t2,t3,test.t4;
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286 |
CREATE TABLE t1 (
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287 |
id smallint(5) unsigned NOT NULL auto_increment,
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288 |
name char(60) DEFAULT '' NOT NULL,
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289 |
PRIMARY KEY (id)
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290 |
);
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291 |
INSERT INTO t1 VALUES (1,'Antonio Paz');
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292 |
INSERT INTO t1 VALUES (2,'Lilliana Angelovska');
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293 |
INSERT INTO t1 VALUES (3,'Thimble Smith');
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294 |
CREATE TABLE t2 (
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295 |
id smallint(5) unsigned NOT NULL auto_increment,
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296 |
owner smallint(5) unsigned DEFAULT '0' NOT NULL,
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297 |
name char(60),
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298 |
PRIMARY KEY (id)
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299 |
);
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300 |
INSERT INTO t2 VALUES (1,1,'El Gato');
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301 |
INSERT INTO t2 VALUES (2,1,'Perrito');
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302 |
INSERT INTO t2 VALUES (3,3,'Happy');
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|
303 |
select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner);
|
|
304 |
name name id
|
|
305 |
Antonio Paz El Gato 1
|
|
306 |
Antonio Paz Perrito 2
|
|
307 |
Lilliana Angelovska NULL NULL
|
|
308 |
Thimble Smith Happy 3
|
|
309 |
select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.id is null;
|
|
310 |
name name id
|
|
311 |
Lilliana Angelovska NULL NULL
|
|
312 |
explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.id is null;
|
|
313 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
314 |
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
315 |
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; Not exists
|
|
316 |
explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.name is null;
|
|
317 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
318 |
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
319 |
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where
|
|
320 |
select count(*) from t1 left join t2 on (t1.id = t2.owner);
|
|
321 |
count(*)
|
|
322 |
4
|
|
323 |
select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner);
|
|
324 |
name name id
|
|
325 |
Antonio Paz El Gato 1
|
|
326 |
Antonio Paz Perrito 2
|
|
327 |
Lilliana Angelovska NULL NULL
|
|
328 |
Thimble Smith Happy 3
|
|
329 |
select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.id is null;
|
|
330 |
name name id
|
|
331 |
Lilliana Angelovska NULL NULL
|
|
332 |
explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.id is null;
|
|
333 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
334 |
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
335 |
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; Not exists
|
|
336 |
explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.name is null;
|
|
337 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
338 |
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
339 |
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where
|
|
340 |
select count(*) from t2 right join t1 on (t1.id = t2.owner);
|
|
341 |
count(*)
|
|
342 |
4
|
|
343 |
select t1.name, t2.name, t2.id,t3.id from t2 right join t1 on (t1.id = t2.owner) left join t1 as t3 on t3.id=t2.owner;
|
|
344 |
name name id id
|
|
345 |
Antonio Paz El Gato 1 1
|
|
346 |
Antonio Paz Perrito 2 1
|
|
347 |
Lilliana Angelovska NULL NULL NULL
|
|
348 |
Thimble Smith Happy 3 3
|
|
349 |
select t1.name, t2.name, t2.id,t3.id from t1 right join t2 on (t1.id = t2.owner) right join t1 as t3 on t3.id=t2.owner;
|
|
350 |
name name id id
|
|
351 |
Antonio Paz El Gato 1 1
|
|
352 |
Antonio Paz Perrito 2 1
|
|
353 |
NULL NULL NULL 2
|
|
354 |
Thimble Smith Happy 3 3
|
|
355 |
select t1.name, t2.name, t2.id, t2.owner, t3.id from t1 left join t2 on (t1.id = t2.owner) right join t1 as t3 on t3.id=t2.owner;
|
|
356 |
name name id owner id
|
|
357 |
Antonio Paz El Gato 1 1 1
|
|
358 |
Antonio Paz Perrito 2 1 1
|
|
359 |
NULL NULL NULL NULL 2
|
|
360 |
Thimble Smith Happy 3 3 3
|
|
361 |
drop table t1,t2;
|
|
362 |
create table t1 (id int not null, str char(10), index(str));
|
|
363 |
insert into t1 values (1, null), (2, null), (3, "foo"), (4, "bar");
|
|
364 |
select * from t1 where str is not null order by id;
|
|
365 |
id str
|
|
366 |
3 foo
|
|
367 |
4 bar
|
|
368 |
select * from t1 where str is null;
|
|
369 |
id str
|
|
370 |
1 NULL
|
|
371 |
2 NULL
|
|
372 |
drop table t1;
|
|
373 |
CREATE TABLE t1 (
|
|
374 |
t1_id bigint(21) NOT NULL auto_increment,
|
|
375 |
PRIMARY KEY (t1_id)
|
|
376 |
);
|
|
377 |
CREATE TABLE t2 (
|
|
378 |
t2_id bigint(21) NOT NULL auto_increment,
|
|
379 |
PRIMARY KEY (t2_id)
|
|
380 |
);
|
|
381 |
CREATE TABLE t3 (
|
|
382 |
t3_id bigint(21) NOT NULL auto_increment,
|
|
383 |
PRIMARY KEY (t3_id)
|
|
384 |
);
|
|
385 |
CREATE TABLE t4 (
|
|
386 |
seq_0_id bigint(21) DEFAULT '0' NOT NULL,
|
|
387 |
seq_1_id bigint(21) DEFAULT '0' NOT NULL,
|
|
388 |
KEY seq_0_id (seq_0_id),
|
|
389 |
KEY seq_1_id (seq_1_id)
|
|
390 |
);
|
|
391 |
CREATE TABLE t5 (
|
|
392 |
seq_0_id bigint(21) DEFAULT '0' NOT NULL,
|
|
393 |
seq_1_id bigint(21) DEFAULT '0' NOT NULL,
|
|
394 |
KEY seq_1_id (seq_1_id),
|
|
395 |
KEY seq_0_id (seq_0_id)
|
|
396 |
);
|
|
397 |
insert into t1 values (1);
|
|
398 |
insert into t2 values (1);
|
|
399 |
insert into t3 values (1);
|
|
400 |
insert into t4 values (1,1);
|
|
401 |
insert into t5 values (1,1);
|
|
402 |
explain select * from t3 left join t4 on t4.seq_1_id = t2.t2_id left join t1 on t1.t1_id = t4.seq_0_id left join t5 on t5.seq_0_id = t1.t1_id left join t2 on t2.t2_id = t5.seq_1_id where t3.t3_id = 23;
|
|
403 |
ERROR 42S22: Unknown column 't2.t2_id' in 'on clause'
|
|
404 |
drop table t1,t2,t3,t4,t5;
|
|
405 |
create table t1 (n int, m int, o int, key(n));
|
|
406 |
create table t2 (n int not null, m int, o int, primary key(n));
|
|
407 |
insert into t1 values (1, 2, 11), (1, 2, 7), (2, 2, 8), (1,2,9),(1,3,9);
|
|
408 |
insert into t2 values (1, 2, 3),(2, 2, 8), (4,3,9),(3,2,10);
|
|
409 |
select t1.*, t2.* from t1 left join t2 on t1.n = t2.n and
|
|
410 |
t1.m = t2.m where t1.n = 1;
|
|
411 |
n m o n m o
|
|
412 |
1 2 11 1 2 3
|
|
413 |
1 2 7 1 2 3
|
|
414 |
1 2 9 1 2 3
|
|
415 |
1 3 9 NULL NULL NULL
|
|
416 |
select t1.*, t2.* from t1 left join t2 on t1.n = t2.n and
|
|
417 |
t1.m = t2.m where t1.n = 1 order by t1.o;
|
|
418 |
n m o n m o
|
|
419 |
1 2 7 1 2 3
|
|
420 |
1 2 9 1 2 3
|
|
421 |
1 3 9 NULL NULL NULL
|
|
422 |
1 2 11 1 2 3
|
|
423 |
drop table t1,t2;
|
|
424 |
CREATE TABLE t1 (id1 INT NOT NULL PRIMARY KEY, dat1 CHAR(1), id2 INT);
|
|
425 |
INSERT INTO t1 VALUES (1,'a',1);
|
|
426 |
INSERT INTO t1 VALUES (2,'b',1);
|
|
427 |
INSERT INTO t1 VALUES (3,'c',2);
|
|
428 |
CREATE TABLE t2 (id2 INT NOT NULL PRIMARY KEY, dat2 CHAR(1));
|
|
429 |
INSERT INTO t2 VALUES (1,'x');
|
|
430 |
INSERT INTO t2 VALUES (2,'y');
|
|
431 |
INSERT INTO t2 VALUES (3,'z');
|
|
432 |
SELECT t2.id2 FROM t2 LEFT OUTER JOIN t1 ON t1.id2 = t2.id2 WHERE id1 IS NULL;
|
|
433 |
id2
|
|
434 |
3
|
|
435 |
SELECT t2.id2 FROM t2 NATURAL LEFT OUTER JOIN t1 WHERE id1 IS NULL;
|
|
436 |
id2
|
|
437 |
3
|
|
438 |
drop table t1,t2;
|
|
439 |
create table t1 ( color varchar(20), name varchar(20) );
|
|
440 |
insert into t1 values ( 'red', 'apple' );
|
|
441 |
insert into t1 values ( 'yellow', 'banana' );
|
|
442 |
insert into t1 values ( 'green', 'lime' );
|
|
443 |
insert into t1 values ( 'black', 'grape' );
|
|
444 |
insert into t1 values ( 'blue', 'blueberry' );
|
|
445 |
create table t2 ( count int, color varchar(20) );
|
|
446 |
insert into t2 values (10, 'green');
|
|
447 |
insert into t2 values (5, 'black');
|
|
448 |
insert into t2 values (15, 'white');
|
|
449 |
insert into t2 values (7, 'green');
|
|
450 |
select * from t1;
|
|
451 |
color name
|
|
452 |
red apple
|
|
453 |
yellow banana
|
|
454 |
green lime
|
|
455 |
black grape
|
|
456 |
blue blueberry
|
|
457 |
select * from t2;
|
|
458 |
count color
|
|
459 |
10 green
|
|
460 |
5 black
|
|
461 |
15 white
|
|
462 |
7 green
|
|
463 |
select * from t2 natural join t1;
|
|
464 |
color count name
|
|
465 |
green 10 lime
|
|
466 |
green 7 lime
|
|
467 |
black 5 grape
|
|
468 |
select t2.count, t1.name from t2 natural join t1;
|
|
469 |
count name
|
|
470 |
10 lime
|
|
471 |
7 lime
|
|
472 |
5 grape
|
|
473 |
select t2.count, t1.name from t2 inner join t1 using (color);
|
|
474 |
count name
|
|
475 |
10 lime
|
|
476 |
7 lime
|
|
477 |
5 grape
|
|
478 |
drop table t1;
|
|
479 |
drop table t2;
|
|
480 |
CREATE TABLE t1 (
|
|
481 |
pcode varchar(8) DEFAULT '' NOT NULL
|
|
482 |
);
|
|
483 |
INSERT INTO t1 VALUES ('kvw2000'),('kvw2001'),('kvw3000'),('kvw3001'),('kvw3002'),('kvw3500'),('kvw3501'),('kvw3502'),('kvw3800'),('kvw3801'),('kvw3802'),('kvw3900'),('kvw3901'),('kvw3902'),('kvw4000'),('kvw4001'),('kvw4002'),('kvw4200'),('kvw4500'),('kvw5000'),('kvw5001'),('kvw5500'),('kvw5510'),('kvw5600'),('kvw5601'),('kvw6000'),('klw1000'),('klw1020'),('klw1500'),('klw2000'),('klw2001'),('klw2002'),('kld2000'),('klw2500'),('kmw1000'),('kmw1500'),('kmw2000'),('kmw2001'),('kmw2100'),('kmw3000'),('kmw3200');
|
|
484 |
CREATE TABLE t2 (
|
|
485 |
pcode varchar(8) DEFAULT '' NOT NULL,
|
|
486 |
KEY pcode (pcode)
|
|
487 |
);
|
|
488 |
INSERT INTO t2 VALUES ('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw6000'),('kvw6000'),('kld2000');
|
|
489 |
SELECT t1.pcode, IF(ISNULL(t2.pcode), 0, COUNT(*)) AS count FROM t1
|
|
490 |
LEFT JOIN t2 ON t1.pcode = t2.pcode GROUP BY t1.pcode;
|
|
491 |
pcode count
|
|
492 |
kld2000 1
|
|
493 |
klw1000 0
|
|
494 |
klw1020 0
|
|
495 |
klw1500 0
|
|
496 |
klw2000 0
|
|
497 |
klw2001 0
|
|
498 |
klw2002 0
|
|
499 |
klw2500 0
|
|
500 |
kmw1000 0
|
|
501 |
kmw1500 0
|
|
502 |
kmw2000 0
|
|
503 |
kmw2001 0
|
|
504 |
kmw2100 0
|
|
505 |
kmw3000 0
|
|
506 |
kmw3200 0
|
|
507 |
kvw2000 26
|
|
508 |
kvw2001 0
|
|
509 |
kvw3000 36
|
|
510 |
kvw3001 0
|
|
511 |
kvw3002 0
|
|
512 |
kvw3500 26
|
|
513 |
kvw3501 0
|
|
514 |
kvw3502 0
|
|
515 |
kvw3800 0
|
|
516 |
kvw3801 0
|
|
517 |
kvw3802 0
|
|
518 |
kvw3900 0
|
|
519 |
kvw3901 0
|
|
520 |
kvw3902 0
|
|
521 |
kvw4000 0
|
|
522 |
kvw4001 0
|
|
523 |
kvw4002 0
|
|
524 |
kvw4200 0
|
|
525 |
kvw4500 0
|
|
526 |
kvw5000 0
|
|
527 |
kvw5001 0
|
|
528 |
kvw5500 0
|
|
529 |
kvw5510 0
|
|
530 |
kvw5600 0
|
|
531 |
kvw5601 0
|
|
532 |
kvw6000 2
|
|
533 |
SELECT SQL_BIG_RESULT t1.pcode, IF(ISNULL(t2.pcode), 0, COUNT(*)) AS count FROM t1 LEFT JOIN t2 ON t1.pcode = t2.pcode GROUP BY t1.pcode;
|
|
534 |
pcode count
|
|
535 |
kld2000 1
|
|
536 |
klw1000 0
|
|
537 |
klw1020 0
|
|
538 |
klw1500 0
|
|
539 |
klw2000 0
|
|
540 |
klw2001 0
|
|
541 |
klw2002 0
|
|
542 |
klw2500 0
|
|
543 |
kmw1000 0
|
|
544 |
kmw1500 0
|
|
545 |
kmw2000 0
|
|
546 |
kmw2001 0
|
|
547 |
kmw2100 0
|
|
548 |
kmw3000 0
|
|
549 |
kmw3200 0
|
|
550 |
kvw2000 26
|
|
551 |
kvw2001 0
|
|
552 |
kvw3000 36
|
|
553 |
kvw3001 0
|
|
554 |
kvw3002 0
|
|
555 |
kvw3500 26
|
|
556 |
kvw3501 0
|
|
557 |
kvw3502 0
|
|
558 |
kvw3800 0
|
|
559 |
kvw3801 0
|
|
560 |
kvw3802 0
|
|
561 |
kvw3900 0
|
|
562 |
kvw3901 0
|
|
563 |
kvw3902 0
|
|
564 |
kvw4000 0
|
|
565 |
kvw4001 0
|
|
566 |
kvw4002 0
|
|
567 |
kvw4200 0
|
|
568 |
kvw4500 0
|
|
569 |
kvw5000 0
|
|
570 |
kvw5001 0
|
|
571 |
kvw5500 0
|
|
572 |
kvw5510 0
|
|
573 |
kvw5600 0
|
|
574 |
kvw5601 0
|
|
575 |
kvw6000 2
|
|
576 |
drop table t1,t2;
|
|
577 |
CREATE TABLE t1 (
|
|
578 |
id int(11),
|
|
579 |
pid int(11),
|
|
580 |
rep_del tinyint(4),
|
|
581 |
KEY id (id),
|
|
582 |
KEY pid (pid)
|
|
583 |
);
|
|
584 |
INSERT INTO t1 VALUES (1,NULL,NULL);
|
|
585 |
INSERT INTO t1 VALUES (2,1,NULL);
|
|
586 |
select * from t1 LEFT JOIN t1 t2 ON (t1.id=t2.pid) AND t2.rep_del IS NULL;
|
|
587 |
id pid rep_del id pid rep_del
|
|
588 |
1 NULL NULL 2 1 NULL
|
|
589 |
2 1 NULL NULL NULL NULL
|
|
590 |
create index rep_del ON t1(rep_del);
|
|
591 |
select * from t1 LEFT JOIN t1 t2 ON (t1.id=t2.pid) AND t2.rep_del IS NULL;
|
|
592 |
id pid rep_del id pid rep_del
|
|
593 |
1 NULL NULL 2 1 NULL
|
|
594 |
2 1 NULL NULL NULL NULL
|
|
595 |
drop table t1;
|
|
596 |
CREATE TABLE t1 (
|
|
597 |
id int(11) DEFAULT '0' NOT NULL,
|
|
598 |
name tinytext DEFAULT '' NOT NULL,
|
|
599 |
UNIQUE id (id)
|
|
600 |
);
|
|
601 |
Warnings:
|
|
602 |
Warning 1101 BLOB/TEXT column 'name' can't have a default value
|
|
603 |
INSERT INTO t1 VALUES (1,'yes'),(2,'no');
|
|
604 |
CREATE TABLE t2 (
|
|
605 |
id int(11) DEFAULT '0' NOT NULL,
|
|
606 |
idx int(11) DEFAULT '0' NOT NULL,
|
|
607 |
UNIQUE id (id,idx)
|
|
608 |
);
|
|
609 |
INSERT INTO t2 VALUES (1,1);
|
|
610 |
explain SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
|
|
611 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
612 |
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
|
613 |
1 SIMPLE t2 ref id id 4 test.t1.id 1 Using where; Using index; Not exists
|
|
614 |
SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
|
|
615 |
id name id idx
|
|
616 |
2 no NULL NULL
|
|
617 |
drop table t1,t2;
|
|
618 |
create table t1 (bug_id mediumint, reporter mediumint);
|
|
619 |
create table t2 (bug_id mediumint, who mediumint, index(who));
|
|
620 |
insert into t2 values (1,1),(1,2);
|
|
621 |
insert into t1 values (1,1),(2,1);
|
|
622 |
SELECT * FROM t1 LEFT JOIN t2 ON (t1.bug_id = t2.bug_id AND t2.who = 2) WHERE (t1.reporter = 2 OR t2.who = 2);
|
|
623 |
bug_id reporter bug_id who
|
|
624 |
1 1 1 2
|
|
625 |
drop table t1,t2;
|
|
626 |
create table t1 (fooID smallint unsigned auto_increment, primary key (fooID));
|
|
627 |
create table t2 (fooID smallint unsigned not null, barID smallint unsigned not null, primary key (fooID,barID));
|
|
628 |
insert into t1 (fooID) values (10),(20),(30);
|
|
629 |
insert into t2 values (10,1),(20,2),(30,3);
|
|
630 |
explain select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
|
|
631 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
632 |
1 SIMPLE t2 index NULL PRIMARY 4 NULL 3 Using index
|
|
633 |
1 SIMPLE t1 const PRIMARY PRIMARY 2 const 1 Using index
|
|
634 |
select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
|
|
635 |
fooID barID fooID
|
|
636 |
10 1 NULL
|
|
637 |
20 2 NULL
|
|
638 |
30 3 30
|
|
639 |
select * from t2 left join t1 ignore index(primary) on t1.fooID = t2.fooID and t1.fooID = 30;
|
|
640 |
fooID barID fooID
|
|
641 |
10 1 NULL
|
|
642 |
20 2 NULL
|
|
643 |
30 3 30
|
|
644 |
drop table t1,t2;
|
|
645 |
create table t1 (i int);
|
|
646 |
create table t2 (i int);
|
|
647 |
create table t3 (i int);
|
|
648 |
insert into t1 values(1),(2);
|
|
649 |
insert into t2 values(2),(3);
|
|
650 |
insert into t3 values(2),(4);
|
|
651 |
select * from t1 natural left join t2 natural left join t3;
|
|
652 |
i
|
|
653 |
1
|
|
654 |
2
|
|
655 |
select * from t1 natural left join t2 where (t2.i is not null)=0;
|
|
656 |
i
|
|
657 |
1
|
|
658 |
select * from t1 natural left join t2 where (t2.i is not null) is not null;
|
|
659 |
i
|
|
660 |
1
|
|
661 |
2
|
|
662 |
select * from t1 natural left join t2 where (i is not null)=0;
|
|
663 |
i
|
|
664 |
select * from t1 natural left join t2 where (i is not null) is not null;
|
|
665 |
i
|
|
666 |
1
|
|
667 |
2
|
|
668 |
drop table t1,t2,t3;
|
|
669 |
create table t1 (f1 integer,f2 integer,f3 integer);
|
|
670 |
create table t2 (f2 integer,f4 integer);
|
|
671 |
create table t3 (f3 integer,f5 integer);
|
|
672 |
select * from t1
|
|
673 |
left outer join t2 using (f2)
|
|
674 |
left outer join t3 using (f3);
|
|
675 |
f3 f2 f1 f4 f5
|
|
676 |
drop table t1,t2,t3;
|
|
677 |
create table t1 (a1 int, a2 int);
|
|
678 |
create table t2 (b1 int not null, b2 int);
|
|
679 |
create table t3 (c1 int, c2 int);
|
|
680 |
insert into t1 values (1,2), (2,2), (3,2);
|
|
681 |
insert into t2 values (1,3), (2,3);
|
|
682 |
insert into t3 values (2,4), (3,4);
|
|
683 |
select * from t1 left join t2 on b1 = a1 left join t3 on c1 = a1 and b1 is null;
|
|
684 |
a1 a2 b1 b2 c1 c2
|
|
685 |
1 2 1 3 NULL NULL
|
|
686 |
2 2 2 3 NULL NULL
|
|
687 |
3 2 NULL NULL 3 4
|
|
688 |
explain select * from t1 left join t2 on b1 = a1 left join t3 on c1 = a1 and b1 is null;
|
|
689 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
690 |
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
691 |
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
|
|
692 |
1 SIMPLE t3 ALL NULL NULL NULL NULL 2
|
|
693 |
drop table t1, t2, t3;
|
|
694 |
create table t1 (
|
|
695 |
a int(11),
|
|
696 |
b char(10),
|
|
697 |
key (a)
|
|
698 |
);
|
|
699 |
insert into t1 (a) values (1),(2),(3),(4);
|
|
700 |
create table t2 (a int);
|
|
701 |
select * from t1 left join t2 on t1.a=t2.a where not (t2.a <=> t1.a);
|
|
702 |
a b a
|
|
703 |
1 NULL NULL
|
|
704 |
2 NULL NULL
|
|
705 |
3 NULL NULL
|
|
706 |
4 NULL NULL
|
|
707 |
select * from t1 left join t2 on t1.a=t2.a having not (t2.a <=> t1.a);
|
|
708 |
a b a
|
|
709 |
1 NULL NULL
|
|
710 |
2 NULL NULL
|
|
711 |
3 NULL NULL
|
|
712 |
4 NULL NULL
|
|
713 |
drop table t1,t2;
|
|
714 |
create table t1 (
|
|
715 |
match_id tinyint(3) unsigned not null auto_increment,
|
|
716 |
home tinyint(3) unsigned default '0',
|
|
717 |
unique key match_id (match_id),
|
|
718 |
key match_id_2 (match_id)
|
|
719 |
);
|
|
720 |
insert into t1 values("1", "2");
|
|
721 |
create table t2 (
|
|
722 |
player_id tinyint(3) unsigned default '0',
|
|
723 |
match_1_h tinyint(3) unsigned default '0',
|
|
724 |
key player_id (player_id)
|
|
725 |
);
|
|
726 |
insert into t2 values("1", "5");
|
|
727 |
insert into t2 values("2", "9");
|
|
728 |
insert into t2 values("3", "3");
|
|
729 |
insert into t2 values("4", "7");
|
|
730 |
insert into t2 values("5", "6");
|
|
731 |
insert into t2 values("6", "8");
|
|
732 |
insert into t2 values("7", "4");
|
|
733 |
insert into t2 values("8", "12");
|
|
734 |
insert into t2 values("9", "11");
|
|
735 |
insert into t2 values("10", "10");
|
|
736 |
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
|
|
737 |
(t2 s left join t1 m on m.match_id = 1)
|
|
738 |
order by m.match_id desc;
|
|
739 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
740 |
1 SIMPLE s ALL NULL NULL NULL NULL 10 Using temporary; Using filesort
|
|
741 |
1 SIMPLE m const match_id,match_id_2 match_id 1 const 1
|
|
742 |
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
|
|
743 |
(t2 s left join t1 m on m.match_id = 1)
|
|
744 |
order by UUX desc;
|
|
745 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
746 |
1 SIMPLE s ALL NULL NULL NULL NULL 10 Using temporary; Using filesort
|
|
747 |
1 SIMPLE m const match_id,match_id_2 match_id 1 const 1
|
|
748 |
select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
|
|
749 |
(t2 s left join t1 m on m.match_id = 1)
|
|
750 |
order by UUX desc;
|
|
751 |
player_id match_1_h * match_id home UUX
|
|
752 |
8 12 * 1 2 10
|
|
753 |
9 11 * 1 2 9
|
|
754 |
10 10 * 1 2 8
|
|
755 |
2 9 * 1 2 7
|
|
756 |
6 8 * 1 2 6
|
|
757 |
4 7 * 1 2 5
|
|
758 |
5 6 * 1 2 4
|
|
759 |
1 5 * 1 2 3
|
|
760 |
7 4 * 1 2 2
|
|
761 |
3 3 * 1 2 1
|
|
762 |
explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
|
|
763 |
t2 s straight_join t1 m where m.match_id = 1
|
|
764 |
order by UUX desc;
|
|
765 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
766 |
1 SIMPLE s ALL NULL NULL NULL NULL 10 Using temporary; Using filesort
|
|
767 |
1 SIMPLE m const match_id,match_id_2 match_id 1 const 1
|
|
768 |
select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
|
|
769 |
t2 s straight_join t1 m where m.match_id = 1
|
|
770 |
order by UUX desc;
|
|
771 |
player_id match_1_h * match_id home UUX
|
|
772 |
8 12 * 1 2 10
|
|
773 |
9 11 * 1 2 9
|
|
774 |
10 10 * 1 2 8
|
|
775 |
2 9 * 1 2 7
|
|
776 |
6 8 * 1 2 6
|
|
777 |
4 7 * 1 2 5
|
|
778 |
5 6 * 1 2 4
|
|
779 |
1 5 * 1 2 3
|
|
780 |
7 4 * 1 2 2
|
|
781 |
3 3 * 1 2 1
|
|
782 |
drop table t1, t2;
|
|
783 |
create table t1 (a int, b int, unique index idx (a, b));
|
|
784 |
create table t2 (a int, b int, c int, unique index idx (a, b));
|
|
785 |
insert into t1 values (1, 10), (1,11), (2,10), (2,11);
|
|
786 |
insert into t2 values (1,10,3);
|
|
787 |
select t1.a, t1.b, t2.c from t1 left join t2
|
|
788 |
on t1.a=t2.a and t1.b=t2.b and t2.c=3
|
|
789 |
where t1.a=1 and t2.c is null;
|
|
790 |
a b c
|
|
791 |
1 11 NULL
|
|
792 |
drop table t1, t2;
|
|
793 |
CREATE TABLE t1 (
|
|
794 |
ts_id bigint(20) default NULL,
|
|
795 |
inst_id tinyint(4) default NULL,
|
|
796 |
flag_name varchar(64) default NULL,
|
|
797 |
flag_value text,
|
|
798 |
UNIQUE KEY ts_id (ts_id,inst_id,flag_name)
|
|
799 |
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
|
|
800 |
CREATE TABLE t2 (
|
|
801 |
ts_id bigint(20) default NULL,
|
|
802 |
inst_id tinyint(4) default NULL,
|
|
803 |
flag_name varchar(64) default NULL,
|
|
804 |
flag_value text,
|
|
805 |
UNIQUE KEY ts_id (ts_id,inst_id,flag_name)
|
|
806 |
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
|
|
807 |
INSERT INTO t1 VALUES
|
|
808 |
(111056548820001, 0, 'flag1', NULL),
|
|
809 |
(111056548820001, 0, 'flag2', NULL),
|
|
810 |
(2, 0, 'other_flag', NULL);
|
|
811 |
INSERT INTO t2 VALUES
|
|
812 |
(111056548820001, 3, 'flag1', 'sss');
|
|
813 |
SELECT t1.flag_name,t2.flag_value
|
|
814 |
FROM t1 LEFT JOIN t2
|
|
815 |
ON (t1.ts_id = t2.ts_id AND t1.flag_name = t2.flag_name AND
|
|
816 |
t2.inst_id = 3)
|
|
817 |
WHERE t1.inst_id = 0 AND t1.ts_id=111056548820001 AND
|
|
818 |
t2.flag_value IS NULL;
|
|
819 |
flag_name flag_value
|
|
820 |
flag2 NULL
|
|
821 |
DROP TABLE t1,t2;
|
|
822 |
CREATE TABLE t1 (
|
|
823 |
id int(11) unsigned NOT NULL auto_increment,
|
|
824 |
text_id int(10) unsigned default NULL,
|
|
825 |
PRIMARY KEY (id)
|
|
826 |
);
|
|
827 |
INSERT INTO t1 VALUES("1", "0");
|
|
828 |
INSERT INTO t1 VALUES("2", "10");
|
|
829 |
CREATE TABLE t2 (
|
|
830 |
text_id char(3) NOT NULL default '',
|
|
831 |
language_id char(3) NOT NULL default '',
|
|
832 |
text_data text,
|
|
833 |
PRIMARY KEY (text_id,language_id)
|
|
834 |
);
|
|
835 |
INSERT INTO t2 VALUES("0", "EN", "0-EN");
|
|
836 |
INSERT INTO t2 VALUES("0", "SV", "0-SV");
|
|
837 |
INSERT INTO t2 VALUES("10", "EN", "10-EN");
|
|
838 |
INSERT INTO t2 VALUES("10", "SV", "10-SV");
|
|
839 |
SELECT t1.id, t1.text_id, t2.text_data
|
|
840 |
FROM t1 LEFT JOIN t2
|
|
841 |
ON t1.text_id = t2.text_id
|
|
842 |
AND t2.language_id = 'SV'
|
|
843 |
WHERE (t1.id LIKE '%' OR t2.text_data LIKE '%');
|
|
844 |
id text_id text_data
|
|
845 |
1 0 0-SV
|
|
846 |
2 10 10-SV
|
|
847 |
DROP TABLE t1, t2;
|
|
848 |
CREATE TABLE t0 (a0 int PRIMARY KEY);
|
|
849 |
CREATE TABLE t1 (a1 int PRIMARY KEY);
|
|
850 |
CREATE TABLE t2 (a2 int);
|
|
851 |
CREATE TABLE t3 (a3 int);
|
|
852 |
INSERT INTO t0 VALUES (1);
|
|
853 |
INSERT INTO t1 VALUES (1);
|
|
854 |
INSERT INTO t2 VALUES (1), (2);
|
|
855 |
INSERT INTO t3 VALUES (1), (2);
|
|
856 |
SELECT * FROM t1 LEFT JOIN t2 ON a1=0;
|
|
857 |
a1 a2
|
|
858 |
1 NULL
|
|
859 |
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON a1=0;
|
|
860 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
861 |
1 SIMPLE t1 system NULL NULL NULL NULL 1
|
|
862 |
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
|
|
863 |
SELECT * FROM t1 LEFT JOIN (t2,t3) ON a1=0;
|
|
864 |
a1 a2 a3
|
|
865 |
1 NULL NULL
|
|
866 |
EXPLAIN SELECT * FROM t1 LEFT JOIN (t2,t3) ON a1=0;
|
|
867 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
868 |
1 SIMPLE t1 system NULL NULL NULL NULL 1
|
|
869 |
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
|
|
870 |
1 SIMPLE t3 ALL NULL NULL NULL NULL 2
|
|
871 |
SELECT * FROM t0, t1 LEFT JOIN (t2,t3) ON a1=0 WHERE a0=a1;
|
|
872 |
a0 a1 a2 a3
|
|
873 |
1 1 NULL NULL
|
|
874 |
EXPLAIN SELECT * FROM t0, t1 LEFT JOIN (t2,t3) ON a1=0 WHERE a0=a1;
|
|
875 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
876 |
1 SIMPLE t0 system PRIMARY NULL NULL NULL 1
|
|
877 |
1 SIMPLE t1 system PRIMARY NULL NULL NULL 1
|
|
878 |
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
|
|
879 |
1 SIMPLE t3 ALL NULL NULL NULL NULL 2
|
|
880 |
INSERT INTO t0 VALUES (0);
|
|
881 |
INSERT INTO t1 VALUES (0);
|
|
882 |
SELECT * FROM t0, t1 LEFT JOIN (t2,t3) ON a1=5 WHERE a0=a1 AND a0=1;
|
|
883 |
a0 a1 a2 a3
|
|
884 |
1 1 NULL NULL
|
|
885 |
EXPLAIN SELECT * FROM t0, t1 LEFT JOIN (t2,t3) ON a1=5 WHERE a0=a1 AND a0=1;
|
|
886 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
887 |
1 SIMPLE t0 const PRIMARY PRIMARY 4 const 1 Using index
|
|
888 |
1 SIMPLE t1 const PRIMARY PRIMARY 4 const 1 Using index
|
|
889 |
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
|
|
890 |
1 SIMPLE t3 ALL NULL NULL NULL NULL 2
|
|
891 |
drop table t1,t2;
|
|
892 |
create table t1 (a int, b int);
|
|
893 |
insert into t1 values (1,1),(2,2),(3,3);
|
|
894 |
create table t2 (a int, b int);
|
|
895 |
insert into t2 values (1,1), (2,2);
|
|
896 |
select * from t2 right join t1 on t2.a=t1.a;
|
|
897 |
a b a b
|
|
898 |
1 1 1 1
|
|
899 |
2 2 2 2
|
|
900 |
NULL NULL 3 3
|
|
901 |
select straight_join * from t2 right join t1 on t2.a=t1.a;
|
|
902 |
a b a b
|
|
903 |
1 1 1 1
|
|
904 |
2 2 2 2
|
|
905 |
NULL NULL 3 3
|
|
906 |
DROP TABLE t0,t1,t2,t3;
|
|
907 |
CREATE TABLE t1 (a int PRIMARY KEY, b int);
|
|
908 |
CREATE TABLE t2 (a int PRIMARY KEY, b int);
|
|
909 |
INSERT INTO t1 VALUES (1,1), (2,1), (3,1), (4,2);
|
|
910 |
INSERT INTO t2 VALUES (1,2), (2,2);
|
|
911 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a;
|
|
912 |
a b a b
|
|
913 |
1 1 1 2
|
|
914 |
2 1 2 2
|
|
915 |
3 1 NULL NULL
|
|
916 |
4 2 NULL NULL
|
|
917 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t1.b=1;
|
|
918 |
a b a b
|
|
919 |
1 1 1 2
|
|
920 |
2 1 2 2
|
|
921 |
3 1 NULL NULL
|
|
922 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
|
|
923 |
WHERE t1.b=1 XOR (NOT ISNULL(t2.a) AND t2.b=1);
|
|
924 |
a b a b
|
|
925 |
1 1 1 2
|
|
926 |
2 1 2 2
|
|
927 |
3 1 NULL NULL
|
|
928 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE not(0+(t1.a=30 and t2.b=1));
|
|
929 |
a b a b
|
|
930 |
1 1 1 2
|
|
931 |
2 1 2 2
|
|
932 |
3 1 NULL NULL
|
|
933 |
4 2 NULL NULL
|
|
934 |
DROP TABLE t1,t2;
|
|
935 |
set group_concat_max_len=5;
|
|
936 |
create table t1 (a int, b varchar(20));
|
|
937 |
create table t2 (a int, c varchar(20));
|
|
938 |
insert into t1 values (1,"aaaaaaaaaa"),(2,"bbbbbbbbbb");
|
|
939 |
insert into t2 values (1,"cccccccccc"),(2,"dddddddddd");
|
|
940 |
select group_concat(t1.b,t2.c) from t1 left join t2 using(a) group by t1.a;
|
|
941 |
group_concat(t1.b,t2.c)
|
|
942 |
aaaaa
|
|
943 |
bbbbb
|
|
944 |
Warnings:
|
|
945 |
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
|
946 |
select group_concat(t1.b,t2.c) from t1 inner join t2 using(a) group by t1.a;
|
|
947 |
group_concat(t1.b,t2.c)
|
|
948 |
aaaaa
|
|
949 |
bbbbb
|
|
950 |
Warnings:
|
|
951 |
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
|
952 |
select group_concat(t1.b,t2.c) from t1 left join t2 using(a) group by a;
|
|
953 |
group_concat(t1.b,t2.c)
|
|
954 |
aaaaa
|
|
955 |
bbbbb
|
|
956 |
Warnings:
|
|
957 |
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
|
958 |
select group_concat(t1.b,t2.c) from t1 inner join t2 using(a) group by a;
|
|
959 |
group_concat(t1.b,t2.c)
|
|
960 |
aaaaa
|
|
961 |
bbbbb
|
|
962 |
Warnings:
|
|
963 |
Warning 1260 2 line(s) were cut by GROUP_CONCAT()
|
|
964 |
drop table t1, t2;
|
|
965 |
set group_concat_max_len=default;
|
|
966 |
create table t1 (gid smallint(5) unsigned not null, x int(11) not null, y int(11) not null, art int(11) not null, primary key (gid,x,y));
|
|
967 |
insert t1 values (1, -5, -8, 2), (1, 2, 2, 1), (1, 1, 1, 1);
|
|
968 |
create table t2 (gid smallint(5) unsigned not null, x int(11) not null, y int(11) not null, id int(11) not null, primary key (gid,id,x,y), key id (id));
|
|
969 |
insert t2 values (1, -5, -8, 1), (1, 1, 1, 1), (1, 2, 2, 1);
|
|
970 |
create table t3 ( set_id smallint(5) unsigned not null, id tinyint(4) unsigned not null, name char(12) not null, primary key (id,set_id));
|
|
971 |
insert t3 values (0, 1, 'a'), (1, 1, 'b'), (0, 2, 'c'), (1, 2, 'd'), (1, 3, 'e'), (1, 4, 'f'), (1, 5, 'g'), (1, 6, 'h');
|
|
972 |
explain select name from t1 left join t2 on t1.x = t2.x and t1.y = t2.y
|
|
973 |
left join t3 on t1.art = t3.id where t2.id =1 and t2.x = -5 and t2.y =-8
|
|
974 |
and t1.gid =1 and t2.gid =1 and t3.set_id =1;
|
|
975 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
976 |
1 SIMPLE t1 const PRIMARY PRIMARY 10 const,const,const 1
|
|
977 |
1 SIMPLE t2 const PRIMARY,id PRIMARY 14 const,const,const,const 1 Using index
|
|
978 |
1 SIMPLE t3 const PRIMARY PRIMARY 3 const,const 1
|
|
979 |
drop tables t1,t2,t3;
|
|
980 |
CREATE TABLE t1 (c11 int);
|
|
981 |
CREATE TABLE t2 (c21 int);
|
|
982 |
INSERT INTO t1 VALUES (30), (40), (50);
|
|
983 |
INSERT INTO t2 VALUES (300), (400), (500);
|
|
984 |
SELECT * FROM t1 LEFT JOIN t2 ON (c11=c21 AND c21=30) WHERE c11=40;
|
|
985 |
c11 c21
|
|
986 |
40 NULL
|
|
987 |
DROP TABLE t1, t2;
|
|
988 |
CREATE TABLE t1 (a int PRIMARY KEY, b int);
|
|
989 |
CREATE TABLE t2 (a int PRIMARY KEY, b int);
|
|
990 |
INSERT INTO t1 VALUES (1,2), (2,1), (3,2), (4,3), (5,6), (6,5), (7,8), (8,7), (9,10);
|
|
991 |
INSERT INTO t2 VALUES (3,0), (4,1), (6,4), (7,5);
|
|
992 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t2.b <= t1.a AND t1.a <= t1.b;
|
|
993 |
a b a b
|
|
994 |
7 8 7 5
|
|
995 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a BETWEEN t2.b AND t1.b;
|
|
996 |
a b a b
|
|
997 |
7 8 7 5
|
|
998 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a NOT BETWEEN t2.b AND t1.b);
|
|
999 |
a b a b
|
|
1000 |
7 8 7 5
|
|
1001 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t2.b > t1.a OR t1.a > t1.b;
|
|
1002 |
a b a b
|
|
1003 |
2 1 NULL NULL
|
|
1004 |
3 2 3 0
|
|
1005 |
4 3 4 1
|
|
1006 |
6 5 6 4
|
|
1007 |
8 7 NULL NULL
|
|
1008 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a NOT BETWEEN t2.b AND t1.b;
|
|
1009 |
a b a b
|
|
1010 |
2 1 NULL NULL
|
|
1011 |
3 2 3 0
|
|
1012 |
4 3 4 1
|
|
1013 |
6 5 6 4
|
|
1014 |
8 7 NULL NULL
|
|
1015 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a BETWEEN t2.b AND t1.b);
|
|
1016 |
a b a b
|
|
1017 |
2 1 NULL NULL
|
|
1018 |
3 2 3 0
|
|
1019 |
4 3 4 1
|
|
1020 |
6 5 6 4
|
|
1021 |
8 7 NULL NULL
|
|
1022 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a = t2.a OR t2.b > t1.a OR t1.a > t1.b;
|
|
1023 |
a b a b
|
|
1024 |
2 1 NULL NULL
|
|
1025 |
3 2 3 0
|
|
1026 |
4 3 4 1
|
|
1027 |
6 5 6 4
|
|
1028 |
7 8 7 5
|
|
1029 |
8 7 NULL NULL
|
|
1030 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a != t2.a AND t1.a BETWEEN t2.b AND t1.b);
|
|
1031 |
a b a b
|
|
1032 |
2 1 NULL NULL
|
|
1033 |
3 2 3 0
|
|
1034 |
4 3 4 1
|
|
1035 |
6 5 6 4
|
|
1036 |
7 8 7 5
|
|
1037 |
8 7 NULL NULL
|
|
1038 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a = t2.a AND (t2.b > t1.a OR t1.a > t1.b);
|
|
1039 |
a b a b
|
|
1040 |
3 2 3 0
|
|
1041 |
4 3 4 1
|
|
1042 |
6 5 6 4
|
|
1043 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a != t2.a OR t1.a BETWEEN t2.b AND t1.b);
|
|
1044 |
a b a b
|
|
1045 |
3 2 3 0
|
|
1046 |
4 3 4 1
|
|
1047 |
6 5 6 4
|
|
1048 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a = t2.a OR t1.a = t2.b;
|
|
1049 |
a b a b
|
|
1050 |
3 2 3 0
|
|
1051 |
4 3 4 1
|
|
1052 |
6 5 6 4
|
|
1053 |
7 8 7 5
|
|
1054 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a IN(t2.a, t2.b);
|
|
1055 |
a b a b
|
|
1056 |
3 2 3 0
|
|
1057 |
4 3 4 1
|
|
1058 |
6 5 6 4
|
|
1059 |
7 8 7 5
|
|
1060 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a NOT IN(t2.a, t2.b));
|
|
1061 |
a b a b
|
|
1062 |
3 2 3 0
|
|
1063 |
4 3 4 1
|
|
1064 |
6 5 6 4
|
|
1065 |
7 8 7 5
|
|
1066 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a != t1.b AND t1.a != t2.b;
|
|
1067 |
a b a b
|
|
1068 |
3 2 3 0
|
|
1069 |
4 3 4 1
|
|
1070 |
6 5 6 4
|
|
1071 |
7 8 7 5
|
|
1072 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a NOT IN(t1.b, t2.b);
|
|
1073 |
a b a b
|
|
1074 |
3 2 3 0
|
|
1075 |
4 3 4 1
|
|
1076 |
6 5 6 4
|
|
1077 |
7 8 7 5
|
|
1078 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t1.a IN(t1.b, t2.b));
|
|
1079 |
a b a b
|
|
1080 |
3 2 3 0
|
|
1081 |
4 3 4 1
|
|
1082 |
6 5 6 4
|
|
1083 |
7 8 7 5
|
|
1084 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t2.a != t2.b OR (t1.a != t2.a AND t1.a != t2.b);
|
|
1085 |
a b a b
|
|
1086 |
3 2 3 0
|
|
1087 |
4 3 4 1
|
|
1088 |
6 5 6 4
|
|
1089 |
7 8 7 5
|
|
1090 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t2.a = t2.b AND t1.a IN(t2.a, t2.b));
|
|
1091 |
a b a b
|
|
1092 |
3 2 3 0
|
|
1093 |
4 3 4 1
|
|
1094 |
6 5 6 4
|
|
1095 |
7 8 7 5
|
|
1096 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t2.a != t2.b AND t1.a != t1.b AND t1.a != t2.b;
|
|
1097 |
a b a b
|
|
1098 |
3 2 3 0
|
|
1099 |
4 3 4 1
|
|
1100 |
6 5 6 4
|
|
1101 |
7 8 7 5
|
|
1102 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE NOT(t2.a = t2.b OR t1.a IN(t1.b, t2.b));
|
|
1103 |
a b a b
|
|
1104 |
3 2 3 0
|
|
1105 |
4 3 4 1
|
|
1106 |
6 5 6 4
|
|
1107 |
7 8 7 5
|
|
1108 |
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a = t2.a OR t1.a = t2.b;
|
|
1109 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
1110 |
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 4
|
|
1111 |
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.a 1
|
|
1112 |
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a IN(t2.a, t2.b);
|
|
1113 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
1114 |
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 4 Using where
|
|
1115 |
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.a 1
|
|
1116 |
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a > IF(t1.a = t2.b-2, t2.b, t2.b-1);
|
|
1117 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
1118 |
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 4 Using where
|
|
1119 |
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.a 1
|
|
1120 |
DROP TABLE t1,t2;
|
|
1121 |
CREATE TABLE t1 (a int);
|
|
1122 |
CREATE TABLE t2 (b int);
|
|
1123 |
INSERT INTO t1 VALUES (1), (2), (3), (4);
|
|
1124 |
INSERT INTO t2 VALUES (2), (3);
|
|
1125 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (1=1);
|
|
1126 |
a b
|
|
1127 |
1 NULL
|
|
1128 |
2 2
|
|
1129 |
3 3
|
|
1130 |
4 NULL
|
|
1131 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (1 OR 1);
|
|
1132 |
a b
|
|
1133 |
1 NULL
|
|
1134 |
2 2
|
|
1135 |
3 3
|
|
1136 |
4 NULL
|
|
1137 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (0 OR 1);
|
|
1138 |
a b
|
|
1139 |
1 NULL
|
|
1140 |
2 2
|
|
1141 |
3 3
|
|
1142 |
4 NULL
|
|
1143 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (1=1 OR 2=2);
|
|
1144 |
a b
|
|
1145 |
1 NULL
|
|
1146 |
2 2
|
|
1147 |
3 3
|
|
1148 |
4 NULL
|
|
1149 |
SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.b WHERE (1=1 OR 1=0);
|
|
1150 |
a b
|
|
1151 |
1 NULL
|
|
1152 |
2 2
|
|
1153 |
3 3
|
|
1154 |
4 NULL
|
|
1155 |
DROP TABLE t1,t2;
|
|
1156 |
CREATE TABLE t1 (
|
|
1157 |
f1 varchar(16) collate latin1_swedish_ci PRIMARY KEY,
|
|
1158 |
f2 varchar(16) collate latin1_swedish_ci
|
|
1159 |
);
|
|
1160 |
CREATE TABLE t2 (
|
|
1161 |
f1 varchar(16) collate latin1_swedish_ci PRIMARY KEY,
|
|
1162 |
f3 varchar(16) collate latin1_swedish_ci
|
|
1163 |
);
|
|
1164 |
INSERT INTO t1 VALUES ('bla','blah');
|
|
1165 |
INSERT INTO t2 VALUES ('bla','sheep');
|
|
1166 |
SELECT * FROM t1 JOIN t2 USING(f1) WHERE f1='Bla';
|
|
1167 |
f1 f2 f3
|
|
1168 |
bla blah sheep
|
|
1169 |
SELECT * FROM t1 LEFT JOIN t2 USING(f1) WHERE f1='bla';
|
|
1170 |
f1 f2 f3
|
|
1171 |
bla blah sheep
|
|
1172 |
SELECT * FROM t1 LEFT JOIN t2 USING(f1) WHERE f1='Bla';
|
|
1173 |
f1 f2 f3
|
|
1174 |
bla blah sheep
|
|
1175 |
DROP TABLE t1,t2;
|
|
1176 |
CREATE TABLE t1 (id int PRIMARY KEY, a varchar(8));
|
|
1177 |
CREATE TABLE t2 (id int NOT NULL, b int NOT NULL, INDEX idx(id));
|
|
1178 |
INSERT INTO t1 VALUES
|
|
1179 |
(1,'aaaaaaa'), (5,'eeeeeee'), (4,'ddddddd'), (2,'bbbbbbb'), (3,'ccccccc');
|
|
1180 |
INSERT INTO t2 VALUES
|
|
1181 |
(3,10), (2,20), (5,30), (3,20), (5,10), (3,40), (3,30), (2,10), (2,40);
|
|
1182 |
EXPLAIN
|
|
1183 |
SELECT t1.id, a FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.b IS NULL;
|
|
1184 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
1185 |
1 SIMPLE t1 ALL NULL NULL NULL NULL 5
|
|
1186 |
1 SIMPLE t2 ref idx idx 4 test.t1.id 2 Using where; Not exists
|
|
1187 |
flush status;
|
|
1188 |
SELECT t1.id, a FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.b IS NULL;
|
|
1189 |
id a
|
|
1190 |
1 aaaaaaa
|
|
1191 |
4 ddddddd
|
|
1192 |
show status like 'Handler_read%';
|
|
1193 |
Variable_name Value
|
|
1194 |
Handler_read_first 0
|
|
1195 |
Handler_read_key 5
|
|
1196 |
Handler_read_next 0
|
|
1197 |
Handler_read_prev 0
|
|
1198 |
Handler_read_rnd 0
|
|
1199 |
Handler_read_rnd_next 6
|
|
1200 |
DROP TABLE t1,t2;
|
|
1201 |
CREATE TABLE t1 (c int PRIMARY KEY, e int NOT NULL);
|
|
1202 |
INSERT INTO t1 VALUES (1,0), (2,1);
|
|
1203 |
CREATE TABLE t2 (d int PRIMARY KEY);
|
|
1204 |
INSERT INTO t2 VALUES (1), (2), (3);
|
|
1205 |
EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON e<>0 WHERE c=1 AND d IS NULL;
|
|
1206 |
id select_type table type possible_keys key key_len ref rows Extra
|
|
1207 |
1 SIMPLE t1 const PRIMARY PRIMARY 4 const 1
|
|
1208 |
1 SIMPLE t2 index NULL PRIMARY 4 NULL 3 Using where; Using index; Not exists
|
|
1209 |
SELECT * FROM t1 LEFT JOIN t2 ON e<>0 WHERE c=1 AND d IS NULL;
|
|
1210 |
c e d
|
|
1211 |
1 0 NULL
|
|
1212 |
SELECT * FROM t1 LEFT JOIN t2 ON e<>0 WHERE c=1 AND d<=>NULL;
|
|
1213 |
c e d
|
|
1214 |
1 0 NULL
|
|
1215 |
DROP TABLE t1,t2;
|