mysql安装
执行命令apt list | grep "mysql"查找mysql软件包
找到软件包，执行apt install mysql-server-8.0/focal-security安装mysql
执行mysql进入mysql
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY "123456";
Query OK, 0 rows affected (0.01 sec)
mysql> exit;
Bye
修改密码为123456
下次登陆使用命令mysql -uroot -p，然后输入密码登陆
mycli安装
mycli是一个mysql命令行工具，具有sql语句提示的功能
输入apt install mycli安装mycil
使用方法
登陆mycli -uroot，然后输入密码登陆