<>,!=

运算符说明

<>, != 运算符仅当左操作数不等于右操作数时返回 true。

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)