在mysql数据库开发中,我们有时候需要复制或拷贝一张表结构和数据到例外一张表,这个时候我们可以使用create ... select ... from语句来实现,本文章向大家介绍mysql复制表结构和数据一个简单实例,
比如现在有一张表,我们要将该表复制一份,以备以后使用,那么如何使用mysql语句来实现呢?其实我们可以直接使用create ... select ... from语句来实现,具体实现方法请看下面实例。
我们先来创建一张Topic表,创建Topic表的SQL语句如下:
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mysql> CREATE TABLE Topic( -> TopicID SMALLINT NOT NULL AUTO_INCREMENT PRIMARY KEY , -> Name VARCHAR (50) NOT NULL , -> InStock SMALLINT UNSIGNED NOT NULL , -> OnOrder SMALLINT UNSIGNED NOT NULL , -> Reserved SMALLINT UNSIGNED NOT NULL , -> Department ENUM( 'Classical' , 'Popular' ) NOT NULL , -> Category VARCHAR (20) NOT NULL , -> RowUpdate TIMESTAMP NOT NULL -> ); |
向Topic表中插入数据:
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mysql> INSERT INTO Topic ( Name , InStock, OnOrder, Reserved, Department, Category) VALUES -> ( 'Java' , 10, 5, 3, 'Popular' , 'Rock' ), -> ( 'JavaScript' , 10, 5, 3, 'Classical' , 'Opera' ), -> ( 'C Sharp' , 17, 4, 1, 'Popular' , 'Jazz' ), -> ( 'C' , 9, 4, 2, 'Classical' , 'Dance' ), -> ( 'C++' , 24, 2, 5, 'Classical' , 'General' ), -> ( 'Perl' , 16, 6, 8, 'Classical' , 'Vocal' ), -> ( 'Python' , 2, 25, 6, 'Popular' , 'Blues' ), -> ( 'Php' , 32, 3, 10, 'Popular' , 'Jazz' ), -> ( 'ASP.net' , 12, 15, 13, 'Popular' , 'Country' ), -> ( 'VB.net' , 5, 20, 10, 'Popular' , 'New Age' ), -> ( 'VC.net' , 24, 11, 14, 'Popular' , 'New Age' ), -> ( 'UML' , 42, 17, 17, 'Classical' , 'General' ), -> ( 'www.java2s.com' ,25, 44, 28, 'Classical' , 'Dance' ), -> ( 'Oracle' , 32, 15, 12, 'Classical' , 'General' ), -> ( 'Pl/SQL' , 20, 10, 5, 'Classical' , 'Opera' ), -> ( 'Sql Server' , 23, 12, 8, 'Classical' , 'General' ); Query OK, 16 rows affected (0.00 sec) Records: 16 Duplicates: 0 Warnings: 0 |
现在我们要将这张表复制一份,具体操作如下:
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mysql> CREATE TABLE Topic2 -> ( -> TopicID SMALLINT NOT NULL AUTO_INCREMENT PRIMARY KEY , -> Name VARCHAR (50) NOT NULL , -> InStock SMALLINT UNSIGNED NOT NULL , -> OnOrder SMALLINT UNSIGNED NOT NULL , -> Reserved SMALLINT UNSIGNED NOT NULL , -> Department ENUM( 'Classical' , 'Popular' ) NOT NULL , -> Category VARCHAR (20) NOT NULL , -> RowUpdate TIMESTAMP NOT NULL -> ) -> SELECT * -> FROM Topic |
这样表Topic2和Topic表不仅拥有相同的表结构,表数据也是一样的了。
例外,如果我们只需要复制表结构,不需要复制数据,也可以使用create like来实现:
create table a like users;
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