[22]SQL INSERT INTO SELECT 語句
阿新 • • 發佈:2017-11-12
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[22]SQL INSERT INTO SELECT 語句
INSERT INTO SELECT 語句從一個表復制數據,然後把數據插入到一個已存在的表中。目標表中任何已存在的行都不會受影響。
SQL INSERT INTO SELECT 語法
我們可以從一個表中復制所有的列插入到另一個已存在的表中:
INSERT INTO table2 SELECT * FROM table1;
或者我們可以只復制希望的列插入到另一個已存在的表中:
INSERT INTO table2 (column_name(s)) SELECT column_name(s) FROM table1;
演示數據庫
在本教程中,我們將使用 RUNOOB 樣本數據庫。
下面是選自 "Websites" 表的數據:
+----+--------------+---------------------------+-------+---------+
| id | name | url | alexa | country |
+----+--------------+---------------------------+-------+---------+
| 1 | Google | https://www.google.cm/ | 1 | USA |
| 2 | 淘寶 | https://www.taobao.com/ | 13 | CN |
| 3 | 菜鳥教程 | 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 的數據:
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 | 淘寶 APP | https://www.taobao.com/ | CN | +----+------------+-------------------------+---------+ 3 rows in set (0.00 sec)
SQL INSERT INTO SELECT 實例
復制 "apps" 中的數據插入到 "Websites" 中:
實例
INSERT INTO Websites (name, country) SELECT app_name, country FROM apps;
只復 QQ 的 APP 到 "Websites" 中:
實例
INSERT INTO Websites (name, country) SELECT app_name, country FROM apps WHERE id=1;
[22]SQL INSERT INTO SELECT 語句