If you're looking for a book that can be your reference for every doubt you may have in PL/SQL programming, its syntax and constructions, that's the book for you. The examples are very clear and easy to understand. The author uses examples in both ways, before applying a certain functionality and after applying it, which makes comprehension much better. In case I had no PL/SQL book so far, I wouldn't waste my time buying other ones. There is only one cons: the size and weight of this book. It's not something you'll like to carry in your backpack everyday, but keeping in your shelf as a handy reference book.