MySQL下查看用户、数据库

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命令行下查看用户、数据库：

mysql> use gbk    #进入gbk数据库
Database changed
mysql> show tables;    #查看gbk数据库的所有表
Empty set (0.00 sec)

mysql> use ultrax;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show tables;
mysql> show tables from ultrax;    #查看ultrax数据库的数据表[mysql> show tables in ultrax;]
+-----------------------------------+
| Tables_in_ultrax                  |
+-----------------------------------+
| pre_common_admincp_cmenu          |
| pre_common_admincp_group          |
…………………………………省略部分内容………………………………
| pre_ucenter_tags                  |
| pre_ucenter_vars                  |
+-----------------------------------+
293 rows in set (0.01 sec)

mysql> use gbk
Database changed
mysql> select database();
+------------+
| database() |
+------------+
| gbk        |
+------------+
1 row in set (0.00 sec)

mysql> select user,host from mysql.user;    #查看用户、主机
+------+-----------+
| user | host      |
+------+-----------+
| root | 127.0.0.1 |
| root | ::1       |
|      | lamp      |
| root | lamp      |
|      | localhost |
| root | localhost |
+------+-----------+
6 rows in set (0.06 sec)

mysql> drop user ''@'localhost';    #删除用户名为空，主机名为localhost
mysql> drop user ''@'lamp';    #删除主机名为lamp，用户名为空
Query OK, 0 rows affected (0.09 sec)
mysql> select user,host from mysql.user;    #查看是否删除成功
+------+-----------+
| user | host      |
+------+-----------+
| root | 127.0.0.1 |
| root | ::1       |
|      | lamp      |
| root | lamp      |
| root | localhost |
+------+-----------+
5 rows in set (0.00 sec)
mysql> delete from mysql.user where user='' and host='lamp';    #如果无法删除的可以采用类似此种的方法进行删除
mysql> flush privileges;