<=

运算符说明

<= 运算符用于比较运算。当 <= 左边运算数值小于或等于 <= 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. | true   |
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 userID,score,spID from t1 where userID<=score/spID;
11. +--------+-------+------+
12. | userid | score | spid |
13. +--------+-------+------+
14. |      1 |     1 |    1 |
15. |      1 |     4 |    2 |
16. |      1 |     5 |    1 |
17. |     11 |    99 |    5 |
18. +--------+-------+------+
19. 4 rows in set (0.00 sec)