1. Check the default installation mariadb
rpm -qa |grep mariadb
`-------如果有装的话，就卸载掉,没有就跳过`
2. Uninstall mariadb
rpm -e --nodeps mariadb-libs-5.5.44-2.el7.centos.x86_64
3. Download and install the installation package file
wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
rpm -ivh mysql-community-release-el7-5.noarch.rpm
4. Installation mysql
yum -y install mysql-server
5. Check installed
mysql -V
6. Start mysql service
systemctl start mysqld
systemctl enable mysqld
7. Enter the password to modify mysql
新安装的mysql默认没有密码，可以直接回车进入
[root@localhost ~]# mysql -u root
mysql> use mysql; # 进入mysql库
mysql> update user set password=PASSWORD("输入本机root密码") where User='root';
mysql> flush privileges; # 刷新
mysql> quit # 退出
8. Good to enter the password again with a modified configuration mysql
允许任意ip，通过root用户远程连接，密码为123456
[root@localhost ~]# mysql -u root -p123
mysql> mysql> GRANT ALL PRIVILEGES ON *.* TO root@"%" IDENTIFIED BY "123456";
9. mysql query basis
mysql> show databases; # 查看有哪些库
mysql> use mysql; # 进入mysql库
mysql> show tables; #查看mysql库里的表
mysql> select * from user; #查看user表里的数据
