许多MysqL程序都会带有匿名登录的功能。在刚刚安装完MysqL之后，就可以登录数据库啦。

这对于平时使用MysqL来说也基本没有什么，但是如果我们想部署数据库的时候，这种登录方式式绝对不能存在的！试想一下，如果你的数据库随便就可以进入的话，我想你一定会在半夜收到电话，说数据出问题啦！

下面介绍一下删除匿名用户的方式：

首先使用命令进入数据库

[root@localhost raul]# MysqL -u root -p
Enter password:
Welcome to the MysqL monitor.  Commands end with ; or \g.
Your MysqL connection id is 3
Server version: 5.1.73 Source distribution
Copyright (c) 2000,2013,Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

然后切换数据库，进入我们需要操作的数据库MysqL

MysqL> use MysqL
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

删除之前我们先查看一下数据库的用户表，看看用户的存在情况

MysqL> select user,host from user;
+------+-----------------------+
| user | host                  |
+------+-----------------------+
| root | 127.0.0.1             |
|      | localhost             |
| root | localhost             |
|      | localhost.localdomain |
| root | localhost.localdomain |
+------+-----------------------+
5 rows in set (0.00 sec)

我们看到啦，在user这一列有的行是空的，这就是那个匿名用户啦～！在这一步我们已经找到匿名用户啦，剩下的操作就是删除掉这个用户，保证登录安全

MysqL> delete from user where user='';
Query OK,2 rows affected (0.00 sec)

此时MysqL执行的状态显示我们删除了两行数据，然后执行一边查询命令，确认一下是不是真的删除成功啦啊

MysqL> select user,host from user;
+------+-----------------------+
| user | host                  |
+------+-----------------------+
| root | 127.0.0.1             |
| root | localhost             |
| root | localhost.localdomain |
+------+-----------------------+
3 rows in set (0.00 sec)

OK！已经成功删除啦