A day in the life #2

I was thinking about one of my assignments the other day I wrote a note at the time I was doing it, about a month ago: Nearly finished my assignment. The normalisation is what confused me. There are too many keys: primary keys, foreign keys and composite keys. After studying relational databases it made me wonder if it was worth having a digital database. If I had a database the only key I would need would be the one to the filing cabinet.