<=

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)