|
当第一个参数（即子字符串）或第二个参数（即子字符串）的值为 NULL 时，它将返回 NULL 作为输出。下面的示例将演示它 - 示例mysql> Select LOCATE(NULL,'Ram is a good boy')As Result;
+--------+
| Result |
+--------+
| NULL |
+--------+
1 row in set (0.00 sec)
mysql> Select LOCATE('Ram',NULL)As Result;
+--------+
| Result |
+--------+
| NULL |
+--------+
1 row in set (0.00 sec)登录后复制 |
