<

Operator Description

The < operator is used for comparison operations. When the < left operation value is less than the < right operation value, the < operator returns the result as true.

Grammar Structure

> SELECT x < y;

Example

mysql> SELECT 2 < 2;
+--------+
| 2 < 2 |
+--------+
| false |
+--------+
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 spID,userID,score from t1 where (userID-1)<spID;
+-------+--------+
| spid | userid | score |
+-------+--------+
| 1 | 1 | 1 |
| 2 | 2 | 2 |
| 2 | 1 | 4 |
| 3 | 3 | 3 |
| 1 | 1 | 5 |
+-------+--------+
5 rows in set (0.00 sec)
mysql> select spID,userID,score from t1 where spID<(userID-1);
+-------+--------+
| spid | userid | score |
+-------+--------+
| 4 | 6 | 10 |
| 5 | 11 | 99 |
+-------+--------+
2 rows in set (0.00 sec)