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=

Operator Description

The = operator is used for comparison operations. When the value of the = left operation is equal to the value of the = right operation, the result of the = operator returns true.

Grammar Structure

> SELECT x = y;

Example

mysql> SELECT 2 = 2;
+--------+
| 2 = 2 |
+--------+
| true |
+--------+
1 row in set (0.01 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,spID,score from t1 where userID=spID and userID=score;
+-----------+-------+
| userid | spid | score |
+-----------+-------+
| 1 | 1 | 1 |
| 2 | 2 | 2 |
| 3 | 3 | 3 |
+-----------+-------+
3 rows in set (0.00 sec)