[Unit]
Description=MySQL server
Wants=basic.target
Conflicts=mysql.target
After=basic.target network.target 

[Service]
Restart=on-failure
Type=simple
ExecStartPre=/usr/lib/mysql/mysql-systemd-helper  install
ExecStartPre=/usr/lib/mysql/mysql-systemd-helper  upgrade
ExecStart=/usr/lib/mysql/mysql-systemd-helper     start
ExecStartPost=/usr/lib/mysql/mysql-systemd-helper wait

[Install]
WantedBy=multi-user.target