mysql下删除匿名帐户

1：mysql中的匿名帐户：可以use mysql
 select  * from user;查找后看user项为空的，就表示是匿名账户
如图：

2： 为了提高mysql的安全性，决定删除它。下面就是删除的过程，显然我以root用户登录的linux系统（通过[root@localhost bin]就能看出来）！

[root@localhost bin]# ./mysql_secure_installation

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!
In order to log into MySQL to secure it, we'll need the current
password for the root user.  If you've just installed MySQL, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none):
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MySQL
root user without the proper authorisation.

You already have a root password set, so you can safely answer 'n'.

Change the root password? [Y/n] n
 ... skipping.

By default, a MySQL installation has an anonymous user, allowing anyone
to log into MySQL without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] y
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] n
 ... skipping.

By default, MySQL comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] n
 ... skipping.

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] y
 ... Success!

Cleaning up...



All done!  If you've completed all of the above steps, your MySQL
installation should now be secure.

Thanks for using MySQL!


3：删除后的抓图如下：

或者使用命令：

mysql> delete     from db where User="" \G
Query OK, 2 rows affected (0.00 sec)

mysql> select * from db where User="" \G
Empty set (0.00 sec)

mysql> delete from user where User="" \G
mysql> flush privileges;
mysql> delete from user where Password='' \G
Query OK, 5 rows affected (0.00 sec)

mysql> select * from user where Password='' \G
Empty set (0.00 sec)