I am considering writing an overview of relational database theory. The concern I have is that there is an abundance of published material on the subject--a Google search turned up ~16,000 hits. I have read quite about about the subject and I can't be sure that I wouldn't unintentionally repeat some of it.

Is it enough to provide a brief history and expand on the bits that would be of interest to the audience? After all, it *is* a well known theory, and pretty rock solid to boot. Most of the differences in the documentation I've seen revolve around implementation of the various database engines, and I hope to steer clear of that. But I will still need to use some sort of reference material.

It would make me more comfortable to find a couple of good sources and paraphrase or quote from them. Would it be enough to provide bibliographic references, or should I get the Author/Copyright holders permission and list them in the acknowledgments section?

how would this reconcile with the PDL?

Thanks for any input.
Gary Lyons

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