如何将 LOCATE() 函数与 MySQL WHERE 子句一起使用?
mysqlmysqli database更新于 2025/5/16 10:52:17
当我们将 LOCATE() 函数与 MySQL WHERE 子句一起使用时，我们需要提供子字符串作为第一个参数，将表的列名作为第二个参数以及比较运算符。以下是使用 ‘Student’ 表来演示 − 的示例
示例
假设我们在 ‘Student’ 表中有以下值 −
mysql> Select * from Student; +------+---------+---------+-----------+ | Id | Name | Address | Subject | +------+---------+---------+-----------+ | 1 | Gaurav | Delhi | Computers | | 2 | Aarav | Mumbai | History | | 15 | Harshit | Delhi | Commerce | | 20 | Gaurav | Jaipur | Computers | | 21 | Yashraj | NULL | Math | +------+---------+---------+-----------+ 5 rows in set (0.02 sec)
现在，以下查询显示如何将 LOCATE() 函数与 WHERE 子句一起使用
mysql> Select Name, LOCATE('av',name)As Result from student where LOCATE('av',Name) > 0;
+--------+--------+
| Name | Result |
+--------+--------+
| Gaurav | 5 |
| Aarav | 4 |
| Gaurav | 5 |
+--------+--------+
3 rows in set (0.00 sec)
mysql> select name, LOCATE('av',name)As Result from student where LOCATE('av',Name)=0 ;
+---------+--------+
| name | Result |
+---------+--------+
| Harshit | 0 |
| Yashraj | 0 |
+---------+--------+
2 rows in set (0.00 sec)
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