SQL INSERT INTO SELECT 语句

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 table2SELECT * FROM table1;或者我们可以只复制希望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。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 | k88.net | http:





//www.k88.net/ | 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 QQ 的 APP 到 "Websites" 中：实例INSERT INTO Websites (name, country)SELECT app_name, country FROM appsWHERE id=1;