Celestial Bodies tutorial (SQL) in Ubuntu

Still I would prefered to have some guidelines on what makes booleans useful in a database/how to handle them and proper syntax before having to do this I hope that the next lessons will mention booleans in the context of SQL otherwise I would have to google them

I used booleans much in the past, but I have now replaced booleans with short integer. The main reason why I did this, is that it is more flexible as there may be more options than true or false in the future.