MySQL复制表-SELECT INTO FROM

Posted 2020-10-23 YY&BB姐姐的光阴故事

基础Table：

mysql> select * from staff;
+----+----------+-------+
| id | name     | slary |
+----+----------+-------+
|  3 | haofugui | 10000 |
|  4 | guoming  |  3500 |
|  5 | haotian  |  2900 |
+----+----------+-------+
3 rows in set (0.00 sec)

mysql> describe staff;
+-------+----------+------+-----+---------+----------------+
| Field | Type     | Null | Key | Default | Extra          |
+-------+----------+------+-----+---------+----------------+
| id    | int(11)  | NO   | PRI | NULL    | auto_increment |
| name  | char(20) | YES  |     | NULL    |                |
| slary | int(11)  | YES  |     | NULL    |                |
+-------+----------+------+-----+---------+----------------+
3 rows in set (0.00 sec)

 

语句1：SELECT [field1, field2 | *] into Table2 [IN externaldatabase] from Table1 where condition;

语句2：SELECT A.field1,B.field2 into C [IN externaldatabase] from A [inner | left | right] join B on [condition1] where condition2;

说明：[IN externaldatabase]可以实现跨数据库的数据复制。

注意：目标表（即Table2或C）不要存在，MySQL会自动创建，这是与INSERT INTO SELECT的一个很大的不同点。

 

示例：

mysql> SELECT * INTO Persons_backup FROM Persons;

 

mysql> SELECT *      //跨数据库的数据复制
    -> INTO Persons IN ‘Backup.mdb‘
    -> FROM Persons;

　　

mysql> SELECT LastName,FirstName
    -> INTO Persons_backup
    -> FROM Persons;

　　

mysql> SELECT LastName,Firstname
    -> INTO Persons_backup
    -> FROM Persons
    -> WHERE City=‘Beijing‘;

　　

mysql> SELECT Persons.LastName,Orders.OrderNo  //表连接复制，即多表复制
    -> INTO Persons_Order_Backup
    -> FROM Persons
    -> INNER JOIN Orders
    -> ON Persons.Id_P=Orders.Id_P;