Hey good that you made your stuff work. But keep in mind this thing - The databases are only the repositoires of data. It is you who will have to decide what data goes in where and make sure that you use the capabilities of the database to reflect the exact needs of your data model (your data). Making ad-hoc changes might work bu they may not be fruitful in the long run. Also, analyse the model before you even try to create any tables in the database. That will definitely help in the long run.