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123 lines
2 KiB
Text
123 lines
2 KiB
Text
drop table if exists x1;
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drop table if exists x2;
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set @tmp_subselect_nulls=@@optimizer_switch;
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set optimizer_switch='semijoin=off';
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create table x1(k int primary key, d1 int, d2 int);
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create table x2(k int primary key, d1 int, d2 int);
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insert into x1 values
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(10, 10, 10),
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(20, 20, 20),
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(21, 20, null),
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(30, null, 30),
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(40, 40, 40);
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insert into x2 values
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(10, 10, 10),
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(20, 20, 20),
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(21, 20, null),
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(30, null, 30);
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select *
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from x1
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where (d1, d2) in (select d1, d2
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from x2);
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k d1 d2
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10 10 10
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20 20 20
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select *
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from x1
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where (d1, d2) in (select d1, d2
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from x2) is true;
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k d1 d2
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10 10 10
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20 20 20
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select *
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from x1
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where (d1, d2) in (select d1, d2
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from x2) is false;
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k d1 d2
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40 40 40
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select *
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from x1
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where (d1, d2) in (select d1, d2
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from x2) is unknown;
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k d1 d2
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21 20 NULL
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30 NULL 30
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select *
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from x1
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where d1 in (select d1
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from x2
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where x1.d2=x2.d2);
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k d1 d2
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10 10 10
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20 20 20
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select *
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from x1
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where d1 in (select d1
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from x2
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where x1.d2=x2.d2) is true;
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k d1 d2
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10 10 10
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20 20 20
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select *
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from x1
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where d1 in (select d1
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from x2
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where x1.d2=x2.d2) is false;
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k d1 d2
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21 20 NULL
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40 40 40
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select *
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from x1
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where d1 in (select d1
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from x2
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where x1.d2=x2.d2) is unknown;
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k d1 d2
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30 NULL 30
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select *
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from x1
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where 1 in (select 1
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from x2
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where x1.d1=x2.d1 and x1.d2=x2.d2);
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k d1 d2
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10 10 10
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20 20 20
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select *
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from x1
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where 1 in (select 1
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from x2
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where x1.d1=x2.d1 and x1.d2=x2.d2) is true;
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k d1 d2
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10 10 10
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20 20 20
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select *
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from x1
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where 1 in (select 1
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from x2
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where x1.d1=x2.d1 and x1.d2=x2.d2) is false;
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k d1 d2
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21 20 NULL
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30 NULL 30
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40 40 40
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select *
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from x1
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where 1 in (select 1
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from x2
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where x1.d1=x2.d1 and x1.d2=x2.d2) is unknown;
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k d1 d2
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select *
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from x1
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where exists (select *
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from x2
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where x1.d1=x2.d1 and x1.d2=x2.d2);
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k d1 d2
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10 10 10
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20 20 20
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set optimizer_switch= @tmp_subselect_nulls;
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drop table x1;
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drop table x2;
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select (select 1, 2) in (select 3, 4);
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(select 1, 2) in (select 3, 4)
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0
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select (select NULL, NULL) in (select 3, 4);
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(select NULL, NULL) in (select 3, 4)
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NULL
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