MySQL tutorial:
https://www.tutorialspoint.com/mysql/index.htm
1- log into the mysql database
2- show database / use database
3- list the table / select a table
3- list the user
mysql -u root -psecret radius
mysql> show database;
mysql> use radius;
Database changed
mysql> show tables;
mysql> desc userinfo;
SELECT * from userinfo;
SELECT id, username from userinfo;
