在mysql數(shù)據(jù)庫開發(fā)中，我們有時候需要復制或拷貝一張表結構和數(shù)據(jù)到例外一張表，這個時候我們可以使用create ... select ... from語句來實現(xiàn)，本文章向大家介紹mysql復制表結構和數(shù)據(jù)一個簡單實例，
比如現(xiàn)在有一張表，我們要將該表復制一份，以備以后使用，那么如何使用mysql語句來實現(xiàn)呢？其實我們可以直接使用create ... select ... from語句來實現(xiàn)，具體實現(xiàn)方法請看下面實例。
我們先來創(chuàng)建一張Topic表，創(chuàng)建Topic表的SQL語句如下：
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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表中插入數(shù)據(jù)：
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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 |
現(xiàn)在我們要將這張表復制一份，具體操作如下：
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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 |
這樣表Topic2和Topic表不僅擁有相同的表結構，表數(shù)據(jù)也是一樣的了。
例外，如果我們只需要復制表結構，不需要復制數(shù)據(jù)，也可以使用create like來實現(xiàn)：
create table a like users;
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