SQL is a great, simple to use language to manipulate data within a database. This cheatsheet is aimed at basic SQL for MySQL/MariaDB.
Access on the command line
When prompted enter your password
Create new databases
CREATE DATABASE IF NOT EXISTS
Enter into a database
Once you've got a database selected, you can play with tables
Most of your SQL life will be CRUDing (Create, Read, Update, Delete) data. So I'll cover the basics here