SQL IN 操作符

IN 操作符

IN 操作符允许您在 WHERE 子句中规定多个值。

SQL IN 语法

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

演示数据库

在本教程中，我们将使用 shulanxt 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  | 树懒学堂      | http://www.shulanxt.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     |
+----+---------------+---------------------------+-------+---------+

IN 操作符实例

下面的 SQL 语句选取 name 为 “Google” 或 “树懒学堂” 的所有网站：

实例：

SELECT * FROM Websites
WHERE name IN ('Google','树懒学堂');

输出结果：

mysql>SELECT * FROM Websites
    ->WHERE name IN ('Google','树懒学堂');
+----+--------------+---------------------------+-------+---------+
| id | name         | url                       | alexa | country |
+----+--------------+---------------------------+-------+---------+
| 1  | Google       | https://www.google.cm/    | 1     | USA     |
| 3  | 树懒学堂      | http://www.shulanxt.com/    | 4689  | CN      |
+----+---------------+---------------------------+-------+---------+
2 rows in set (0.00 sec)