mysql安装

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安装mysql

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apt remove --purge *mysql*  
rm -rf /etc/mysql /var/lib/mysql  
apt remove --purge *mariadb*  
apt install mysql-server

这时候root用户没有密码, mysql -uroot 进入mysql命令行界面
设置密码

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alter user 'root'@'localhost' identified with mysql_native_password by 'root';
flush privileges;