Books with titles that accurately reflect its contents, or else do what they say they will do, carry significant weight for me. SQL: QuickStart Guide does precisely what it claims to do, which is provide a simple overview of SQL. If you are brand-new to SQL, this book is helpful; and even if you're not, this book provides a very quick (59 pages, inclusive of separate one-page conclusion and glossary) overview or refresher. The book errs on the side of appealing to the rank beginner--which, to be fair, is what the title says.