<=
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
> SELECT x <= y;
示例
mysql> SELECT 2 <= 2;
+--------+
| 2 <= 2 |
+--------+
| true |
+--------+
1 row in set (0.00 sec)
create table t1 (spID smallint,userID bigint,score int);
insert into t1 values (1,1,1);
insert into t1 values (2,2,2);
insert into t1 values (2,1,4);
insert into t1 values (3,3,3);
insert into t1 values (1,1,5);
insert into t1 values (4,6,10);
insert into t1 values (5,11,99);
mysql> select userID,score,spID from t1 where userID<=score/spID;
+--------+-------+------+
| userid | score | spid |
+--------+-------+------+
| 1 | 1 | 1 |
| 1 | 4 | 2 |
| 1 | 5 | 1 |
| 11 | 99 | 5 |
+--------+-------+------+
4 rows in set (0.00 sec)