Last night I have talked with a IT student.
We were talking about a database design. There are a lot of theories about design, normalization and denormalization.
In the world, that is very different. The database design is not only talking about database. For example, I have a lot of Object mapping framework. My database design need to suit the framework. In addition, currently, diskspace is very cheap. I will pay more attentions of efficiency rather than saving the column save. For example, I like to put some calculate value into a column rather than using "SUM".
Real world is about money. Student life is only for examination.