当我们将 INSTR() 函数与 MySQL WHERE 子句一起使用时,我们需要提供表的列名作为第一个参数,提供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 -
假设“学生”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,以下查询展示了如何将 INSTR() 函数与 WHERE caluse 一起使用 -
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)
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