我们如何在WHERE子句中使用MySQL INSTR()函数？
当我们将INSTR()函数与MySQLWHERE子句一起使用时，我们需要将表的列名作为第一个参数，将子字符串作为第二个参数以及比较运算符。以下是使用“学生”表进行演示的示例-
示例
假设我们在“学生”表中具有以下值-
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，以下查询显示我们如何INSTR()在WHEREcaluse中使用函数-
mysql> select name, INSTR(Name,'av')As Result from student where INSTR(Name,'av') > 0; +--------+--------+ | name | Result | +--------+--------+ | Gaurav | 5 | | Aarav | 4 | | Gaurav | 5 | +--------+--------+ 3 rows in set (0.00 sec) mysql> select name, INSTR(Name,'av')As Result from student where INSTR(Name,'av') = 0 ; +---------+--------+ | name | Result | +---------+--------+ | Harshit | 0 | | Yashraj | 0 | +---------+--------+ 2 rows in set (0.01 sec)