说明：  有很多朋友虽然安装好了mysql但却不知如何使用它。在这篇文章中我们就从连接MYSQL、修改密码、增加用户等方面来学习一些MYSQL的常用命令。
(There are a lot of good friends, although the installation of mysql but I do not know how to use it. In this article we have from the connection MYSQL, change passwords, add users, etc. MYSQL to learn some commonly used commands.)