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DROP TABLE IF EXISTS t1; SELECT IF(NULL AND 1, 1, 2), IF(1 AND NULL, 1, 2); IF(NULL AND 1, 1, 2) IF(1 AND NULL, 1, 2) 2 2 SELECT NULL AND 1, 1 AND NULL, 0 AND NULL, NULL and 0; NULL AND 1 1 AND NULL 0 AND NULL NULL and 0 NULL NULL 0 0 create table t1 (a int); insert into t1 values (0),(1),(NULL); SELECT * FROM t1 WHERE IF(a AND 1, 0, 1); a 0 NULL SELECT * FROM t1 WHERE IF(1 AND a, 0, 1); a 0 NULL SELECT * FROM t1 where NOT(a AND 1); a 0 SELECT * FROM t1 where NOT(1 AND a); a 0 SELECT * FROM t1 where (a AND 1)=0; a 0 SELECT * FROM t1 where (1 AND a)=0; a 0 SELECT * FROM t1 where (1 AND a)=1; a 1 SELECT * FROM t1 where (1 AND a) IS NULL; a NULL set sql_mode='high_not_precedence'; Warnings: Warning 3090 Changing sql mode 'NO_AUTO_CREATE_USER' is deprecated. It will be removed in a future release. select * from t1 where not a between 2 and 3; a set sql_mode=default; select * from t1 where not a between 2 and 3; a 0 1 select a, a is false, a is true, a is unknown from t1; a a is false a is true a is unknown 0 1 0 0 1 0 1 0 NULL 0 0 1 select a, a is not false, a is not true, a is not unknown from t1; a a is not false a is not true a is not unknown 0 0 1 1 1 1 0 1 NULL 1 1 0 SET @a=0, @b=0; SELECT * FROM t1 WHERE NULL AND (@a:=@a+1); a SELECT * FROM t1 WHERE NOT(a>=0 AND NULL AND (@b:=@b+1)); a SELECT * FROM t1 WHERE a=2 OR (NULL AND (@a:=@a+1)); a SELECT * FROM t1 WHERE NOT(a=2 OR (NULL AND (@b:=@b+1))); a DROP TABLE t1; create table t1 (a int, b int); insert into t1 values(null, null), (0, null), (1, null), (null, 0), (null, 1), (0, 0), (0, 1), (1, 0), (1, 1); 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 t1; A B nA nB AB n(AB) nAonB AoB n(AoB) nAnB N N N N N N N N N N 0 N 1 N 0 1 1 N N N 1 N 0 N N N N 1 0 0 N 0 N 1 0 1 1 N N N N 1 N 0 N N N 1 0 0 0 0 1 1 0 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 1 0 0 1 0 1 1 1 0 0 1 1 0 0 1 0 0 1 0 0 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 t1; A B nA nB AB n(AB) nAonB AoB n(AoB) nAnB N N N N N N N N N N 0 N 1 N 0 1 1 N N N 1 N 0 N N N N 1 0 0 N 0 N 1 0 1 1 N N N N 1 N 0 N N N 1 0 0 0 0 1 1 0 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 1 0 0 1 0 1 1 1 0 0 1 1 0 0 1 0 0 1 0 0 drop table t1;