74 lines
2.1 KiB
Plaintext
74 lines
2.1 KiB
Plaintext
drop table if exists t1;
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CREATE TABLE t1
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(
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pk1 INT primary key,
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key1 INT,
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key2 VARCHAR(20),
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key3 VARCHAR(20)
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);
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insert into t1 values(1,12,'a','a1'),(2,11,'a','b1'),(3,10,'b','b1'),(4,9,'c','c1'),
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(5,8,NULL,'d1'),(6,7,NULL,'b1'),(7,6,NULL,'b1'),
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(8,5,'a',NULL),(9,4,'a',NULL),(10,3,NULL,NULL),
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(11,2,'',NULL),(12,1,NULL,'');
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create index i1 on t1(key2,key3);
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select * from t1 where key2='a' and key3=NULL;
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pk1 key1 key2 key3
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select pk1 from t1 where key2='a' and key3=NULL;
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pk1
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select * from t1 where key2='a' and key3>NULL;
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pk1 key1 key2 key3
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select pk1 from t1 where key2='a' and key3>NULL;
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pk1
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select * from t1 where key2='a' and key3<NULL;
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pk1 key1 key2 key3
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select pk1 from t1 where key2='a' and key3<NULL;
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pk1
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select * from t1 where key2='a' and key3>=NULL;
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pk1 key1 key2 key3
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select pk1 from t1 where key2='a' and key3>=NULL;
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pk1
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select * from t1 where key2='a' and key3<=NULL;
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pk1 key1 key2 key3
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select pk1 from t1 where key2='a' and key3<=NULL;
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pk1
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select * from t1 where key2=NULL and key3='b1';
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pk1 key1 key2 key3
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select pk1 from t1 where key2=NULL and key3='b1';
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pk1
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select * from t1 where key2>NULL and key3='b1';
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pk1 key1 key2 key3
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select pk1 from t1 where key2>NULL and key3='b1';
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pk1
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select * from t1 where key2<NULL and key3='b1';
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pk1 key1 key2 key3
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select pk1 from t1 where key2<NULL and key3='b1';
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pk1
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select * from t1 where key2>=NULL and key3='b1';
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pk1 key1 key2 key3
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select pk1 from t1 where key2>=NULL and key3='b1';
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pk1
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select * from t1 where key2<=NULL and key3='b1';
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pk1 key1 key2 key3
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select pk1 from t1 where key2<=NULL and key3='b1';
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pk1
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select * from t1 where key2=NULL and key3=NULL;
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pk1 key1 key2 key3
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select pk1 from t1 where key2=NULL and key3=NULL;
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pk1
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select * from t1 where key2=NULL and key3<NULL;
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pk1 key1 key2 key3
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select pk1 from t1 where key2=NULL and key3<NULL;
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pk1
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select * from t1 where key2=NULL and key3>NULL;
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pk1 key1 key2 key3
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select pk1 from t1 where key2=NULL and key3>NULL;
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pk1
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select * from t1 where key2=NULL and key3<=NULL;
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pk1 key1 key2 key3
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select pk1 from t1 where key2=NULL and key3<=NULL;
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pk1
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select * from t1 where key2=NULL and key3>=NULL;
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pk1 key1 key2 key3
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select pk1 from t1 where key2=NULL and key3>=NULL;
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pk1
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