MySQL学习——有关数据库的操作语句

实例

1 mysql> create database if not exists demo
2     -> default character set utf8
3     -> default collate utf8_general_ci;
4 Query OK, 1 row affected (0.00 sec)
5 
6 mysql> 

查看数据库的定义声明

语法

1 show create database demo;

查询所有的数据库

语法

1 show databases;

实例

 1 mysql> show databases;
 2 +--------------------+
 3 | Database           |
 4 +--------------------+
 5 | information_schema |
 6 | demo               |
 7 | mysql              |
 8 | performance_schema |
 9 +--------------------+
10 4 rows in set (0.00 sec)
11 
12 mysql> 

选择要使用的数据库

语法

1 use demo;

实例

1 mysql> use demo;
2 Database changed
3 mysql> 

修改数据库

语法

1 alter database 数据库名 
2 [default] character set 字符集名 
3 [default] collate 校对规则名;

实例

 1 mysql> show create database demo;
 2 +----------+---------------------------------------------------------------+
 3 | Database | Create Database                                               |
 4 +----------+---------------------------------------------------------------+
 5 | demo     | CREATE DATABASE `demo` /*!40100 DEFAULT CHARACTER SET utf8 */ |
 6 +----------+---------------------------------------------------------------+
 7 1 row in set (0.00 sec)
 8 
 9 mysql> alter database demo 
10     -> character set gb2312 
11     -> collate gb2312_chinese_ci;
12 Query OK, 1 row affected (0.00 sec)
13 
14 mysql> show create database demo;
15 +----------+-----------------------------------------------------------------+
16 | Database | Create Database                                                 |
17 +----------+-----------------------------------------------------------------+
18 | demo     | CREATE DATABASE `demo` /*!40100 DEFAULT CHARACTER SET gb2312 */ |
19 +----------+-----------------------------------------------------------------+
20 1 row in set (0.00 sec)
21 
22 mysql> 

删除数据库

语法

1 drop database [if exists] 数据库名;

实例

1 mysql> drop database demo;
2 Query OK, 0 rows affected, 2 warnings (0.00 sec)
3 
4 mysql> 

MySQL学习——有关数据库的操作语句

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