IN 操作符允许您在 WHERE 子句中规定多个值。
SELECT column_name(s) FROM table_name WHERE column_name IN (value1,value2,...);
在本教程中，我们将使用 Web3 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 | 芝麻教程 | http://www.web3.xin/ | 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 | +----+---------------+---------------------------+-------+---------+
下面的 SQL 语句选取 name 为 "Google" 或 "芝麻教程" 的所有网站：
SELECT * FROM Websites
WHERE name IN ('Google','芝麻教程');
1执行输出结果：
mysql> select * from websites where name in ('芝麻教程','Google');
+----+----------+------------------------+-------+---------+
| id | name | url | alexa | country |
+----+----------+------------------------+-------+---------+
| 1 | Google | https://www.google.cm/ | 1 | USA |
| 3 | 芝麻教程 | http://www.web3.xin/ | 5000 | USA |
+----+----------+------------------------+-------+---------+
2 rows in set (0.00 sec) 