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16 lines
539 B
Text
16 lines
539 B
Text
drop table if exists t1;
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select {fn length("hello")}, { date "1997-10-20" };
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{fn length("hello")} 1997-10-20
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5 1997-10-20
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create table t1 (a int not null auto_increment,b int not null,primary key (a,b));
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insert into t1 SET A=NULL,B=1;
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insert into t1 SET a=null,b=2;
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select * from t1 where a is null and b=2;
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a b
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2 2
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select * from t1 where a is null;
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a b
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explain select * from t1 where b is null;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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drop table t1;
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