Forget about the complaints that this book is just about Sybase SQL. Any book that tries to teach SQL has to use a vendor software as a tool to convey the concepts. This one happens to be using Sybase Anywhere. But it really doesn't matter. Imagine yourself learning how to drive, do you really care whether the car is Honda Accord or Toyota Camry? As long as you don't boycott Japanese product, your only concern should be whether the person sitting next to you is a good driver and teacher!
This book is the best SQL teacher I've ever met. Granted, before reading this book, I've already had graduate level courses on relational database and years of working experience in using several big name vendor databases, but I still learned a lot from this one in both conceptual and technical senses. And because of that, I can tell with 100% confidence that this book teaches SQL in the most efficient and general way - it introduces key SQL concept in a crystal clear manner; it teaches basic SQL syntax in the most standard form as possible and reminds you of the vendor specific variations diligently wherever they occur; it presents the full picture from database design principle to FAQs of daily SQL usages in easy and concise language. It's simply the best SQL book for beginners. For experienced SQLers, this book can serve as a field guide to help you maintain a clear big picture of core SQL when you start to get lost in the forest of numerous vendor specific DBMS products.
Oh, do you really care about the minor typos and the shabby free SQL Anywhere software comes with the book? (p.s., it works with limited functions). Again, your car may have scratches and some fancy functions of the stereo may not work, but as long as your purpose is to learn how to drive and you have a good teacher sitting next to you, it doesn't matter at all.
I'm amazed by how good a teacher the authors are. Having taught myself, I know how difficult teaching could be. The authors of this book really know how to teach - teaching is art, they are masters. I salute them.