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25 lines
914 B
25 lines
914 B
5 months ago
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drop table if exists t1;
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create table t1 (t1 char(3) primary key) charset utf8mb4;
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insert into t1 values("ABC");
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insert into t1 values("ABA");
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insert into t1 values("AB%");
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select * from t1 where t1="ABC";
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t1
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ABC
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select * from t1 where t1="ABCD";
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t1
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select * from t1 where t1 like "a_\%";
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t1
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AB%
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describe select * from t1 where t1="ABC";
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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 const PRIMARY PRIMARY 12 const 1 100.00 Using index
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Warnings:
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Note 1003 /* select#1 */ select 'ABC' AS `t1` from `test`.`t1` where true
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describe select * from t1 where t1="ABCD";
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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 NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
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Warnings:
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Note 1003 /* select#1 */ select 'ABC' AS `t1` from `test`.`t1` where false
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drop table t1;
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