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44 lines
1,008 B
Text
44 lines
1,008 B
Text
drop table if exists t1;
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CREATE TABLE t1 (id CHAR(12) not null, PRIMARY KEY (id));
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insert into t1 values ('000000000001'),('000000000002');
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explain select * from t1 where id=000000000001;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 12 NULL 2 Using where; Using index
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select * from t1 where id=000000000001;
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id
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000000000001
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delete from t1 where id=000000000002;
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select * from t1;
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id
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000000000001
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drop table t1;
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SELECT 'a' = 'a ';
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'a' = 'a '
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1
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SELECT 'a\0' < 'a';
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'a\0' < 'a'
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1
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SELECT 'a\0' < 'a ';
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'a\0' < 'a '
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1
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SELECT 'a\t' < 'a';
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'a\t' < 'a'
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1
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SELECT 'a\t' < 'a ';
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'a\t' < 'a '
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1
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CREATE TABLE t1 (a char(10) not null);
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INSERT INTO t1 VALUES ('a'),('a\0'),('a\t'),('a ');
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SELECT hex(a),STRCMP(a,'a'), STRCMP(a,'a ') FROM t1;
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hex(a) STRCMP(a,'a') STRCMP(a,'a ')
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61 0 0
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6100 -1 -1
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6109 -1 -1
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61 0 0
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DROP TABLE t1;
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SELECT CHAR(31) = '', '' = CHAR(31);
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CHAR(31) = '' '' = CHAR(31)
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0 0
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SELECT CHAR(30) = '', '' = CHAR(30);
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CHAR(30) = '' '' = CHAR(30)
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0 0
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