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MySQL复制表-SELECT INTO FROM

时间:2018-02-03 19:01:53      阅读:176      评论:0      收藏:0      [点我收藏+]

标签:log   gui   str   mysql   语句   ast   order   csharp   extra   

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;

  

MySQL复制表-SELECT INTO FROM

标签:log   gui   str   mysql   语句   ast   order   csharp   extra   

原文地址:https://www.cnblogs.com/yy20141204bb/p/8410343.html

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