5、删除及重命名账户

使用drop user命令删除用户
--查看当前系统中已存在的用户
root@localhost[(none)]> select user,host,Password from mysql.user;
+-------+-----------+-------------------------------------------+
| user  | host      | Password                                  |
+-------+-----------+-------------------------------------------+
| root  | localhost |                                           |
| root  | suse11b   |                                           |
| root  | 127.0.0.1 |                                           |
| root  | ::1       |                                           |
|       | localhost |                                           |
|       | suse11b   |                                           |
| fred  | localhost |                                           |
| frank | %         | *63DAA25989C7E01EB96570FA4DBE154711BEB361 |
| jack  | localhost |                                           |
+-------+-----------+-------------------------------------------+

--使用drop user命令删除用户
root@localhost[(none)]> drop user 'frank'@'%';
Query OK, 0 rows affected (0.00 sec)

root@localhost[(none)]> drop user 'fred'@'localhost';
Query OK, 0 rows affected (0.00 sec)

root@localhost[(none)]> select user,host,Password from mysql.user where user like 'fr%';
Empty set (0.00 sec)

--如何重命名帐户，使用rename user命令
root@localhost[(none)]> rename user 'jack'@'localhost' to 'jason'@'localhost';
Query OK, 0 rows affected (0.00 sec)

root@localhost[(none)]> select user,host,Password from mysql.user where user like 'j%';
+-------+-----------+----------+
| user  | host      | Password |
+-------+-----------+----------+
| jason | localhost |          |
+-------+-----------+----------+

--对于用户的删除也可以直接从mysql.user进行删除相应的记录，但不推荐直接操作mysql系统表

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