[root@localhost /]# rpm -e --nodeps qt-MySQL-4.6.2-26.el6_4.x86_64 
[root@localhost /]# rpm -e --nodeps mysql-server-5.1.71-1.el6.x86_64 
[root@localhost /]# rpm -e --nodeps mysql-libs-5.1.71-1.el6.x86_64 
[root@localhost /]# rpm -e --nodeps mysql-devel-5.1.71-1.el6.x86_64 
[root@localhost /]# rpm -e --nodeps mysql-5.1.71-1.el6.x86_64 
[root@localhost /]# rpm -qa | grep mysql

cd /etc/yum.repos.d/

vi mysql.repo

# Enable to use MySQL 8.0
[mysql80-community]
name=MySQL 8.0 Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

yum repolist enabled | grep mysql