SQL INSERT INTO SELECT 语句
通过 SQL，您可以从一个表复制信息到另一个表。
INSERT INTO SELECT 语句从一个表复制数据，然后把数据插入到一个已存在的表中。
SQL INSERT INTO SELECT 语句
INSERT INTO SELECT 语句从一个表复制数据，然后把数据插入到一个已存在的表中。目标表中任何已存在的行都不会受影响。
SQL INSERT INTO SELECT 语法
我们可以从一个表中复制所有的列插入到另一个已存在的表中：
INSERT INTO table2
SELECT * FROM table1;
或者我们可以只复制指定的列插入到另一个已存在的表中：
INSERT INTO table2
(column_name(s))
SELECT column_name(s)
FROM table1;
演示数据库
在本教程中，我们将使用 RUNOOB 样本数据库。
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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 | 菜鸟教程 | http://www.runoob.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 | +----+---------------+---------------------------+-------+---------+
下面是 "apps" APP 的数据：
mysql> SELECT * FROM apps; +----+------------+-------------------------+---------+ | id | app_name | url | country | +----+------------+-------------------------+---------+ | 1 | QQ APP | http://im.qq.com/ | CN | | 2 | 微博 APP | http://weibo.com/ | CN | | 3 | 淘宝 APP | https://www.taobao.com/ | CN | +----+------------+-------------------------+---------+ 3 rows in set (0.00 sec)
SQL INSERT INTO SELECT 实例
复制 "apps" 中的数据插入到 "Websites" 中：
实例
INSERT INTO Websites (name, country)
SELECT app_name, country FROM apps;
只复 id=1 的数据到 "Websites" 中：
实例
INSERT INTO Websites (name, country)
SELECT app_name, country FROM apps
WHERE id=1;
