37 lines
1.8 KiB
Plaintext
37 lines
1.8 KiB
Plaintext
set tidb_cost_model_version=1;
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drop table if exists t1;
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drop table if exists t2;
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create table t1(a bigint, b bigint);
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create table t2(a bigint, b bigint);
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set session tidb_hashagg_partial_concurrency = 1;
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set session tidb_hashagg_final_concurrency = 1;
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explain format = 'plan_tree' select * from t1 where t1.a in (select t1.b + t2.b from t2);
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drop table if exists t;
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create table t(a int primary key, b int, c int, d int, index idx(b,c,d));
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insert into t values(1,1,1,1),(2,2,2,2),(3,2,2,2),(4,2,2,2),(5,2,2,2);
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analyze table t;
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explain format = 'plan_tree' select t.c in (select count(*) from t s use index(idx), t t1 where s.b = 1 and s.c = 1 and s.d = t.a and s.a = t1.a) from t;
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drop table if exists t;
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create table t(a int, b int, c int);
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explain format = 'plan_tree' select a from t t1 where t1.a = (select max(t2.a) from t t2 where t1.b=t2.b and t1.c=t2.b);
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drop table if exists t1, t2;
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create table t1(a int(11));
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create table t2(a decimal(40,20) unsigned, b decimal(40,20));
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select count(*) as x from t1 group by a having x not in (select a from t2 where x = t2.b);
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drop table if exists stu;
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drop table if exists exam;
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create table stu(id int, name varchar(100));
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insert into stu values(1, null);
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create table exam(stu_id int, course varchar(100), grade int);
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insert into exam values(1, 'math', 100);
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set names utf8 collate utf8_general_ci;
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explain format = 'plan_tree' select * from stu where stu.name not in (select 'guo' from exam where exam.stu_id = stu.id);
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select * from stu where stu.name not in (select 'guo' from exam where exam.stu_id = stu.id);
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set names utf8mb4;
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explain format = 'plan_tree' select * from stu where stu.name not in (select 'guo' from exam where exam.stu_id = stu.id);
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select * from stu where stu.name not in (select 'guo' from exam where exam.stu_id = stu.id);
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