This book is a requirement for a course that I am taking. The book is riddled with errors. You can randomly open any page from the book- and you will find typos and confusing text. On some pages, the powerpoint slides for the book do not even match with the text of the book. This is the sixth edition of this textbook. I consider it inexcusable that the book has hundreds of typos even after being published for more than ten years. As another reviewer pointed out, the additional material that is needed for the book -like SQL schemas- do not even exist in the book's website- contrary to what the book claims. Anybody who is considering this book should think twice. Please get it from the library - go through the book for a week to see what I mean- and dump the book for any book that should be better than this.