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 runoops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 | Amazon | https://z.cn/ | 2 | USA |
| 3 | 淘宝 | https://www.taobao.com/ | 10 | CN |
| 4 | 自学教程 | http://runoops.com/ | 5787 | CN |
| 5 | 微博 | http://weibo.com/ | 18 | CN |
| 6 | stackoverflow | http://stackoverflow.com/ | 66 | IND |
+----+----------------+---------------------------+-------+---------+
IN 操作符实例
下面的 SQL 语句选取 name 为 "Google" 或 "自学教程" 的所有网站:
SELECT * FROM websites
WHERE name IN ('Amazon','自学教程');
输出结果:
mysql> SELECT * FROM websites
-> WHERE name IN ('Amazon','自学教程');
+----+--------------+---------------------+-------+---------+
| id | name | url | alexa | country |
+----+--------------+---------------------+-------+---------+
| 2 | Amazon | https://z.cn/ | 2 | USA |
| 4 | 自学教程 | http://runoops.com/ | 5787 | USA |
+----+--------------+---------------------+-------+---------+
2 rows in set (0.00 sec)