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,...);
FROM table_name
WHERE column_name IN (value1,value2,...);
演示数据库
在本教程中,我们将使用 RUNOOB 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 | 开源教程 | / | 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 "开源教程" 的所有网站:
实例
SELECT * FROM Websites
WHERE name IN ('Google','开源教程');
WHERE name IN ('Google','开源教程');
执行输出结果: