How to detect whether mysql is installed under linux

How to detect whether mysql is installed under Linux: execute the [service mysqld start] command. If it prompts [mysqld: unrecognized service], it means that mysql is not installed in the system. If mysql is successfully started, it means The mysql service has been installed.

#The daemon process of mysql is mysqld.

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If it has been installed, it will prompt:

[root@localhost ~]# service mysqld start
启动 MySQL：    [确定]

If it has not been installed, it will prompt:

[root@localhost ~]# service mysqld start
mysqld:未被识别的服务

yum Install mysql

yum -y install mysql-server

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