1.1 查詢用戶
mysql> use mysql;
mysql> select * from user;
1.2 創建用戶
#主機名可使用%表示所有的主機
mysql> create user '用戶名'@'主機名' identified by '密碼';
1.3 刪除用戶
mysql> drop user 'mytest'@'localhost';
1.4 修改用戶密碼
#可選下面兩種寫法
mysql> update user set password = password('new_password') where user = 'mytest';
mysql> set password for 'mytest'@'localhost' = password('new_password');