MySQL中两种快速创建空表的方式的区别

在MySQL中有两种方法

1、create table t_name select ...

2、create table t_name like ...

第一种会取消掉原来表的有些定义，且引擎是系统默认引擎。

手册上是这么讲的：Some conversion of data types might occur. For example, the AUTO_INCREMENT attribute is not preserved, and VARCHAR columns can become CHAR columns.

第二种就完全复制原表。

先建立测试表:

mysql> create database dbtest;

Query OK, 1 row affected (0.03 sec)

mysql> use dbtest;

Database changed

mysql> create table t_old

-> (

-> id serial,

-> content varchar(8000) not null,

-> `desc` varchar(100) not null)

-> engine innodb;

Query OK, 0 rows affected (0.04 sec)

mysql> show create table t_old;

+-------+-------------------------------------------------+

| Table | Create Table |

+-------+------------------------------------------------+

| t_old | CREATE TABLE `t_old` (

`id` bigint(20) unsigned NOT NULL auto_increment,

`content` varchar(8000) NOT NULL,

`desc` varchar(100) NOT NULL,

UNIQUE KEY `id` (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

+-------+----------------------------------------------------+

1 row in set (0.00 sec)

第一种方式：

mysql> create table t_select select * from t_old where 1 = 0;

Query OK, 0 rows affected (0.04 sec)

Records: 0 Duplicates: 0 Warnings: 0

mysql> show create table t_select;

+----------+--------------------------------------------+

| Table | Create Table +----------+---------------------------------------------+

| t_select | CREATE TABLE `t_select` (

`id` bigint(20) unsigned NOT NULL default '0',

`content` varchar(8000) NOT NULL,

`desc` varchar(100) NOT NULL

) ENGINE=MyISAM DEFAULT CHARSET=latin1 |

+----------+-------------------------------------------+

1 row in set (0.00 sec)

第二种方式：

mysql> create table t_like like t_old;

Query OK, 0 rows affected (0.02 sec)

mysql> show create table t_like;

+--------+-------------------------------------------------+

| Table | Create Table |

+--------+-------------------------------------------------+

| t_like | CREATE TABLE `t_like` (

`id` bigint(20) unsigned NOT NULL auto_increment,

`content` varchar(8000) NOT NULL,

`desc` varchar(100) NOT NULL,

UNIQUE KEY `id` (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

+--------+-------------------------------------------------+

1 row in set (0.00 sec)

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