Where we can find database designs schemes (ERD or other) for very common use cases?

Question

The question is more simple than what it looks. There are many use cases that are well known and people have put a lot of thought into them. For example: Audit trailing, login users, and so on. We are looking for a good resource site that present the DB design for those common use cases.

Answer 1

Check out

http://databaseanswers.org/

There are over 500 data models available for free there. It's not hard to convert them into a working database. For some of them, if you contact the webmaster, they will send you a working MS Access application with a built in database.

Even if you don't use Access this could serve as a prototype.

Answer 2

Try The Data Model Resource Book by Len Silverston. It has 3 volumes and not only shows but also explains the usual use cases.