mysql in 条件——迹忆客-ag捕鱼王app官网

mysql in 子句是用来判断要检索的字段的值是否在给定的数组中，它可以替换or条件。

in 语法

select column_name, function(column_name)
from table_name
where column_name in (value1,value2,....)

示例

要理解in子句，先来看下面的例子。有一个employee_tbl表，该表具有以下记录

mysql> select * from employee_tbl;
 ------ ------ ------------ -------------------- 
|  id  | name | work_date  | daily_typing_pages |
 ------ ------ ------------ -------------------- 
|   1  | john | 2007-01-24 |        250         |
|   2  | ram  | 2007-05-27 |        220         |
|   3  | jack | 2007-05-06 |        170         |
|   3  | jack | 2007-04-06 |        100         |
|   4  | jill | 2007-04-06 |        220         |
|   5  | zara | 2007-06-06 |        300         |
|   5  | zara | 2007-02-06 |        350         |
 ------ ------ ------------ -------------------- 
7 rows in set (0.00 sec)

现在，假设基于上表您想要显示 daily_typing_pages 等于 250、220 和 170 的记录。这可以使用or条件完成，如下所示

mysql>select * from employee_tbl 
   ->where daily_typing_pages= 250 or  
   ->daily_typing_pages= 220 or  daily_typing_pages= 170; 

结果如下：

 ------ ------ ------------ -------------------- 
|  id  | name | work_date  | daily_typing_pages |
 ------ ------ ------------ -------------------- 
|   1  | john | 2007-01-24 |        250         |
|   2  | ram  | 2007-05-27 |        220         |
|   3  | jack | 2007-05-06 |        170         |
|   4  | jill | 2007-04-06 |        220         |
 ------ ------ ------------ -------------------- 
4 rows in set (0.02 sec)

同样可以使用in子句实现如下

mysql> select * from employee_tbl 
   -> where daily_typing_pages in ( 250, 220, 170 );

结果如下：

 ------ ------ ------------ -------------------- 
|  id  | name | work_date  | daily_typing_pages |
 ------ ------ ------------ -------------------- 
|   1  | john | 2007-01-24 |        250         |
|   2  | ram  | 2007-05-27 |        220         |
|   3  | jack | 2007-05-06 |        170         |
|   4  | jill | 2007-04-06 |        220         |
 ------ ------ ------------ -------------------- 
4 rows in set (0.02 sec)