This format will no longer be updated because I switched to TCGPlayer, a free app that can scan your cards and show how much they are worth. But if you want to use this old format for whatever reason, read on:
A while ago, I was making a Pokémon card deck and realized that I should make a database of all my Pokémon cards, so I created a database in MySQL to organize them. This is how the database is structured so far: