58 lines
1.1 KiB
Plaintext
58 lines
1.1 KiB
Plaintext
drop table if exists t1;
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CREATE TABLE t1 (
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a char(5) NOT NULL,
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b char(4) NOT NULL,
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KEY (a),
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KEY (b)
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) charset utf8mb4;
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INSERT INTO t1 VALUES ('A','B'),('b','A'),('C','c'),('D','E'),('a','a');
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select * from t1,t1 as t2;
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a b a b
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a a A B
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D E A B
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C c A B
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b A A B
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A B A B
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a a b A
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D E b A
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C c b A
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b A b A
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A B b A
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a a C c
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D E C c
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C c C c
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b A C c
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A B C c
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a a D E
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D E D E
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C c D E
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b A D E
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A B D E
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a a a a
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D E a a
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C c a a
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b A a a
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A B a a
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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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explain select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 NULL ALL a NULL NULL NULL # # NULL
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1 SIMPLE t2 NULL ref b b 16 test.t1.a # # Using index condition
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Warnings:
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Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` join `test`.`t1` `t2` where (`test`.`t1`.`a` = `test`.`t2`.`b`)
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select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B order by binary t1.a,t2.a;
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a b a b
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A B a a
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A B b A
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C c C c
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a a a a
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a a b A
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b A A B
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select * from t1 where a='a';
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a b
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A B
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a a
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drop table t1;
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