SQL IN 操作符

IN 操作符允许在 WHERE 子句中指定多个值组成的集合。

 

1. IN 语法

SELECT column_name(s)
FROM table_name
WHERE column_name IN (value1,value2,...);

样本数据库

在本教程中，我们将使用 CodeBaoku 样本数据库。

下面是选自 "Websites" 表的数据：

+----+--------------+---------------------------+-------+---------+
| id | name         | url                       | alexa | country |
+----+--------------+---------------------------+-------+---------+
| 1  | Google       | https://www.google.cm/    | 1     | USA     |
| 2  | 淘宝          | https://www.taobao.com/   | 13    | CN      |
| 3  | 编程宝库      | http://www.codebaoku.com/ | 4689  | CN      |
| 4  | 微博          | http://weibo.com/         | 20    | CN      |
| 5  | Facebook     | https://www.facebook.com/ | 3     | USA     |
| 7  | stackoverflow | http://stackoverflow.com/ |   0 | IND     |
+----+---------------+---------------------------+-------+---------+

 

2. IN 范例

下面的 SQL 语句选取 name 为 "Google" 或 "编程宝库" 的所有网站：

SELECT * FROM Websites WHERE name IN ('Google','编程宝库');

执行结果：
+----+--------------+---------------------------+-------+---------+
| id | name         | url                       | alexa | country |
+----+--------------+---------------------------+-------+---------+
| 1  | Google       | https://www.google.cm/    | 1     | USA     |
| 3  | 编程宝库      | http://www.codebaoku.com/ | 4689  | CN      |
+----+--------------+---------------------------+-------+---------+

BETWEEN 操作符用于选取介于两个值之间的数据范围内的值。这些值可以是数值、文本或者日期。SQL BETWEEN 语法：SELECT column_name(s) FROM table_name WHERE column_name BETWEEN value1 AND value2。