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74 lines
2.2 KiB
Text
74 lines
2.2 KiB
Text
DROP TABLE IF EXISTS t1;
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SELECT IF(NULL AND 1, 1, 2), IF(1 AND NULL, 1, 2);
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IF(NULL AND 1, 1, 2) IF(1 AND NULL, 1, 2)
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2 2
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SELECT NULL AND 1, 1 AND NULL, 0 AND NULL, NULL and 0;
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NULL AND 1 1 AND NULL 0 AND NULL NULL and 0
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NULL NULL 0 0
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create table t1 (a int);
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insert into t1 values (0),(1),(NULL);
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SELECT * FROM t1 WHERE IF(a AND 1, 0, 1);
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a
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0
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NULL
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SELECT * FROM t1 WHERE IF(1 AND a, 0, 1);
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a
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0
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NULL
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SELECT * FROM t1 where NOT(a AND 1);
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a
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0
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SELECT * FROM t1 where NOT(1 AND a);
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a
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0
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SELECT * FROM t1 where (a AND 1)=0;
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a
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0
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SELECT * FROM t1 where (1 AND a)=0;
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a
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0
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SELECT * FROM t1 where (1 AND a)=1;
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a
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1
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SELECT * FROM t1 where (1 AND a) IS NULL;
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a
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NULL
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SET @a=0, @b=0;
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SELECT * FROM t1 WHERE NULL AND (@a:=@a+1);
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a
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SELECT * FROM t1 WHERE NOT(a>=0 AND NULL AND (@b:=@b+1));
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a
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SELECT * FROM t1 WHERE a=2 OR (NULL AND (@a:=@a+1));
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a
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SELECT * FROM t1 WHERE NOT(a=2 OR (NULL AND (@b:=@b+1)));
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a
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SELECT @a, @b;
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@a @b
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0 6
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DROP TABLE t1;
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drop table if exists t;
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create table t(a int, b int);
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insert into t values(null, null), (0, null), (1, null), (null, 0), (null, 1), (0, 0), (0, 1), (1, 0), (1, 1);
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select ifnull(A, 'N') as A, ifnull(B, 'N') as B, ifnull(not A, 'N') as nA, ifnull(not B, 'N') as nB, ifnull(A and B, 'N') as AB, ifnull(not (A and B), 'N') as `n(AB)`, ifnull((not A or not B), 'N') as nAonB, ifnull(A or B, 'N') as AoB, ifnull(not(A or B), 'N') as `n(AoB)`, ifnull(not A and not B, 'N') as nAnB from t;
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A B nA nB AB n(AB) nAonB AoB n(AoB) nAnB
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N N N N N N N N N N
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0 N 1 N 0 1 1 N N N
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1 N 0 N N N N 1 0 0
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N 0 N 1 0 1 1 N N N
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N 1 N 0 N N N 1 0 0
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0 0 1 1 0 1 1 0 1 1
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0 1 1 0 0 1 1 1 0 0
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1 0 0 1 0 1 1 1 0 0
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1 1 0 0 1 0 0 1 0 0
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select ifnull(A=1, 'N') as A, ifnull(B=1, 'N') as B, ifnull(not (A=1), 'N') as nA, ifnull(not (B=1), 'N') as nB, ifnull((A=1) and (B=1), 'N') as AB, ifnull(not ((A=1) and (B=1)), 'N') as `n(AB)`, ifnull((not (A=1) or not (B=1)), 'N') as nAonB, ifnull((A=1) or (B=1), 'N') as AoB, ifnull(not((A=1) or (B=1)), 'N') as `n(AoB)`, ifnull(not (A=1) and not (B=1), 'N') as nAnB from t;
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A B nA nB AB n(AB) nAonB AoB n(AoB) nAnB
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N N N N N N N N N N
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0 N 1 N 0 1 1 N N N
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1 N 0 N N N N 1 0 0
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N 0 N 1 0 1 1 N N N
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N 1 N 0 N N N 1 0 0
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0 0 1 1 0 1 1 0 1 1
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0 1 1 0 0 1 1 1 0 0
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1 0 0 1 0 1 1 1 0 0
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1 1 0 0 1 0 0 1 0 0
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drop table t;
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