1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
drop table if exists t1;
drop table if exists t2;
create table t1 (p int not null primary key, u int not null, o int not null,
unique (u), key(o)) engine=ndb;
create table t2 (p int not null primary key, u int not null, o int not null,
unique (u), key(o)) engine=ndb;
insert into t1 values (1,1,1),(2,2,2),(3,3,3);
insert into t2 values (1,1,1),(2,2,2),(3,3,3), (4,4,4), (5,5,5);
explain select * from t2 where p NOT IN (select p from t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where
2 DEPENDENT SUBQUERY t1 unique_subquery PRIMARY PRIMARY 4 func 1 Using index
select * from t2 where p NOT IN (select p from t1) order by p;
p u o
4 4 4
5 5 5
explain select * from t2 where p NOT IN (select u from t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where
2 DEPENDENT SUBQUERY t1 unique_subquery u u 4 func 1 Using index
select * from t2 where p NOT IN (select u from t1) order by p;
p u o
4 4 4
5 5 5
explain select * from t2 where p NOT IN (select o from t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where
2 DEPENDENT SUBQUERY t1 index_subquery o o 4 func 1 Using index
select * from t2 where p NOT IN (select o from t1) order by p;
p u o
4 4 4
5 5 5
explain select * from t2 where p NOT IN (select p+0 from t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 Using where
select * from t2 where p NOT IN (select p+0 from t1) order by p;
p u o
4 4 4
5 5 5
drop table t1;
drop table t2;
|
