<

运算符说明

< 运算符用于比较运算。当 < 左边运算数值小于 < 右侧运算数值时，< 运算符返回结果为 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 (0.00 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 spID,userID,score from t1 where (userID-1)<spID;
11. +------+--------+-------+
12. | spid | userid | score |
13. +------+--------+-------+
14. |    1 |      1 |     1 |
15. |    2 |      2 |     2 |
16. |    2 |      1 |     4 |
17. |    3 |      3 |     3 |
18. |    1 |      1 |     5 |
19. +------+--------+-------+
20. 5 rows in set (0.00 sec)
21. mysql> select spID,userID,score from t1 where spID<(userID-1);
22. +------+--------+-------+
23. | spid | userid | score |
24. +------+--------+-------+
25. |    4 |      6 |    10 |
26. |    5 |     11 |    99 |
27. +------+--------+-------+
28. 2 rows in set (0.00 sec)