References on database design

I’m looking for recommendations here. I have already read recommendations for books by C. J. Date and Codd (I think it was); but I’m wondering if there’s any online references/tutorials/articles or books that someone can point me to. I’m a two and a half hour drive from the library with these books, and I don’t want to buy either without seeing them first, hence the request for online resources. And if the online ones are free, so much the better
Thanks all!

h3. Update

As I find resources or are given them, I’ll add them to this post.

* “Visual Case Tool - Database Design Tutorial”:http://www.visualcase.com/tutorials/database-design-tutorial.htm is very basic but gives a good overview of how foreign keys are used.

* “SQL by Design: How to Choose a Primary Key”:http://www.sqlmag.com/Articles/Index.cfm?ArticleID=5113. Another useful article.

* “Devshed: Cross tabulations with MySQL”:http://www.devshed.com/Server_Side/MySQL/MySQLWiz/