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
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:
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:
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:
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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