Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worthless

I've read both this one and "DATABASE SYSTEMS: A PRACTICAL APPROACH TO DESIGN, IMPLEMENTATION, AND MANAGEMENT" (Connolly/Begg), and the latter is by far the best. Some ideas that takes a few seconds to grasp Connollys book, took me about a half an hour to grasp in this one (which I noticed when I tried to refresh my memory). The reason is that it is written in a sometimes incredibly difficult and complex way. Why? For no good reason at all, as far as I can see. The descriptions are not any more "rigorous" or "exact", they are just difficult without gaining anything. The ideas are the same.Avoid it, unless you want to waste you time with a book that makes learning 10 times slower than with a good one.