MySQL中两种快速创建空表的方式的区别
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)
mysql>
关键字:MySQL、
引擎、系统
新文章:
- CentOS7下图形配置网络的方法
- CentOS 7如何添加删除用户
- 如何解决centos7双系统后丢失windows启动项
- CentOS单网卡如何批量添加不同IP段
- CentOS下iconv命令的介绍
- Centos7 SSH密钥登陆及密码密钥双重验证详解
- CentOS 7.1添加删除用户的方法
- CentOS查找/扫描局域网打印机IP讲解
- CentOS7使用hostapd实现无AP模式的详解
- su命令不能切换root的解决方法
- 解决VMware下CentOS7网络重启出错
- 解决Centos7双系统后丢失windows启动项
- CentOS下如何避免文件覆盖
- CentOS7和CentOS6系统有什么不同呢
- Centos 6.6默认iptable规则详解