<>,!=

运算符说明

The <>,!= operator returns true only if the left-hand operand is not equal to the right-hand operand.

语法结构

  1. > SELECT x <> y;

示例

  1. mysql> SELECT 2 <> 2;
  2. +--------+
  3. | 2 != 2 |
  4. +--------+
  5. | false  |
  6. +--------+
  7. 1 row in set (0.01 sec)
  1. create table t1 (spID smallint,userID bigint,score int);
  2. insert into t1 values (1,1,1);
  3. insert into t1 values (2,2,2);
  4. insert into t1 values (2,1,4);
  5. insert into t1 values (3,3,3);
  6. insert into t1 values (1,1,5);
  7. insert into t1 values (4,6,10);
  8. insert into t1 values (5,11,99);
  10. mysql> select userID,spID,score from t1 where userID=spID and userID<>score;
  11. +--------+------+-------+
  12. | userid | spid | score |
  13. +--------+------+-------+
  14. |      1 |    1 |     5 |
  15. +--------+------+-------+
  16. 1 row in set (0.00 sec)