I think that if you are not familiar with directly accessing databases, then you should not start learning by hacking around with your live Moodle database 
But, https://moodle.org/plugins/local_adminer is a tool you can use. Might be best if you had a throw-away Moodle site you could practice on first.
But, https://moodle.org/plugins/local_adminer is a tool you can use. Might be best if you had a throw-away Moodle site you could practice on first.