刪除用戶

1. 刪除用戶 dywang@localhost。

   MariaDB root@(none):mysql> drop user 'dywang'@'localhost';
   You're about to run a destructive command.
   Do you want to proceed? (y/n): y
   Your call!
   Query OK, 0 rows affected
   Time: 0.012s
   

2. 查詢用戶 dywang，已不存在。

   MariaDB root@(none):(mysql)> select user from user;
   +-------------+
   | User        |
   +-------------+
   | mariadb.sys |
   | mysql       |
   | root        |
   +-------------+
   
   3 rows in set
   Time: 0.016s
   

3. root 登出 mariadb。

   MariaDB root@(none):mysql> quit;
   Goodbye!