centos安装mysql

https://juejin.im/post/5d07cf13f265da1bd522cfb6

如何在windows中完全删除mysql
https://blog.csdn.net/sxingming/article/details/52601250
其中最后一行 sc delete mysql，这里的mysql改为在服务中显示的名字

发现最好的方法还是去官网看手册：
https://dev.mysql.com/doc/refman/5.7/en/linux-installation-yum-repo.html