Uninstall mysql under CentOS7

To uninstall the installed part
    , first execute the check command to see what has been transferred:
    rpm -qa |grep -i mysql

    Start uninstallation
    Execute the uninstall command: yum remove mysql-community mysql-community-server mysql-community-libs

mysql -community-common

    check the uninstallation remnants
    Check if the uninstallation is clean: rpm -qa |grep -i mysql

    uninstallation remnants
    Uninstall the parts that were not uninstalled just now: yum remove mysql-community-release

    Ultimate check Check
    again: rpm -qa |grep -i mysql, the installation part has been completely uninstalled.

    Clean up the file to
    view the mysql file directory: find / -name mysql.

    Delete the file: rm -rf /usr/share/mysql.