Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: This book turned me off databases forever

This book claims to be for beginners, but it is not. The author's style lacks any flow. The examples are unrealistic and unclear. And the writing is turgid. I bought it to learn about normalization and other table design principles, and got nothing but frustration. It's some kind of university textbook, lacking any clear explanation of concepts. I've read several beginner books over the past few months, and this is not a beginner book. Nothing is explained. I've spent 4 hours on it, and am ready to send it back.