centos系统如何查看是否安装了mysql

yum install mysql*

systemctl start mariadb.service 或者 systemctl start mysqld.service

systemctl stop mariadb.service 或者 systemctl stop mysqld.service

systemctl restart mariadb.service 或者 systemctl restart mysqld.service

systemctl enable mariadb.service 或者 systemctl enable mysqld.service