MYSQL 安装时出现的问题error: Failed dependencies

1、错误1：error: Failed dependencies:
        mysql-community-common(x86-64) >= 5.7.9 is needed by mysql-community-libs-5.7.23-1.el7.x86_64
        mariadb-libs is obsoleted by mysql-community-libs-5.7.23-1.el7.x86_64

RPM：通过rpm -qa |grep -i mysql或者是rpm -qa |grep -i mariadb  或者是rpm -qa | grep postfix
rpm -e 包名刚才找到的包名即可

YUM：查询：yum list installed mysql*    卸载：yum remove mysql*

2、错误2：error: Failed dependencies:
        /usr/bin/perl is needed by mysql-community-server-5.7.19-1.el7.x86_64
        libaio.so.1()(64bit) is needed by mysql-community-server-5.7.19-1.el7.x86_64
        libaio.so.1(LIBAIO_0.1)(64bit) is needed by mysql-community-server-5.7.19-1.el7.x86_64
        libaio.so.1(LIBAIO_0.4)(64bit) is needed by mysql-community-server-5.7.19-1.el7.x86_64
        net-tools is needed by mysql-community-server-5.7.19-1.el7.x86_64
        perl(Getopt::Long) is needed by mysql-community-server-5.7.19-1.el7.x86_64
        perl(strict) is needed by mysql-community-server-5.7.19-1.el7.x86_64

缺少：libaio、net-tools、perl这三个包，yum install安装就好了