1.创建数据库mysqlgt; create database if not exists tongcheng; Query OK, 1 row affected (0.01 sec) mysqlgt; 2.查看创建数

1.创建数据库

mysql> create database if not exists tongcheng;

Query OK, 1 row affected (0.01 sec)

mysql>

2.查看创建数据库时的选项

mysql> show create database tongcheng;

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

| Database | Create Database |

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

| tongcheng | CREATE DATABASE `tongcheng` /*!40100 DEFAULT CHARACTER SET latin1 */ |

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

1 row in set (0.00 sec)

mysql>

3.连接数据库

mysql> use tongcheng;

Database changed

mysql>

4.查看当前的数据库

mysql> select database();

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

| database() |

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

| tongcheng |

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

1 row in set (0.01 sec)

mysql>

5.显示所有数据库

mysql> show databases;

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

| Database |

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

| information_schema |

| mysql |

| test |

| tongcheng |

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

4 rows in set (0.00 sec)

mysql>

6.修改数据库的属性

mysql> alter database tongcheng character set gbk;

Query OK, 1 row affected (0.00 sec)

mysql>

7.删除数据库

mysql> drop database if exists tongcheng;

Query OK, 0 rows affected (0.02 sec)

mysql>

8.用mysqladmin创建数据库

123 [root@localhost ~]# mysqladmin create tongcheng -u root -p

Enter password:

[root@localhost ~]#

9.用mysqlshow查看数据库

[root@localhost ~]# mysqlshow -u root -p tongcheng

Enter password:

Database: tongcheng

+--------+

| Tables |

+--------+

+--------+

[root@localhost ~]#

10.用mysqlshow查看数据库有多少表

[root@localhost ~]# mysqlshow -u root -p tongcheng

Enter password:

Database: tongcheng

+--------+

| Tables |

+--------+

| t |

+--------+

[root@localhost ~]#

11.用mysqlshow查看数据库中表的信息

[root@localhost ~]# mysqlshow -u root -p tongcheng t

Enter password:

Database: tongcheng Table: t

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

| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |

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

| a | int(11) | | YES | | | | select,insert,update,references | |

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

[root@localhost ~]#

12.用mysqlshow查看数据库中表的索引信息

[root@localhost ~]# mysqlshow -u root -p -k tongcheng t

Enter password:

Database: tongcheng Table: t

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

| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |

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

| a | int(11) | | YES | MUL | | | select,insert,update,references | |

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

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

| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |

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

| t | 1 | in_tong | 1 | a | A | | | | YES | BTREE | |

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

[root@localhost ~]#

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