This book tells you what you need to know. However, it is a bit of a hard slog because it doesn't tell you why you need to know it. It also throws in obscure acronyms and not only expects you to know what they stand for, but what those protocols/standards/programs imply. Yes, you can learn all you need to know about SQL schema, (and more than you need to know - without telling you why you need to know it, you don't know what to skip), but it is a little more painful than it has to be.