To database developers, administrators or curious students, with love:
It is very unfortunate that destiny had me suffer the tremendous pain and frustration in reading the 3rd edition of "Database Management Systems", by Ramakrishnan and Gehrke, to learn the fundamentals of DBMS, for the contents of the book lack preciseness and clarity, thus, leading to a lot of confusion and ambiguity in the mind of the reader, who is learning databases for the first time (and is presumably an experienced programmer).
Authors of the book have badly failed in properly covering the topics based on clear and formal definitions of fundamental database concepts. Many topics were not dealth with by the authors comprehensively and lack focus too. The book is full of hundreds of lines of explanation that require another expanation. It is true that this book is more like a puzzle for you to put together in order to make heads or tails of what the topic really is all about.
This book seems appealing, however, to the instructors, for the authors have provided them with supplementary material that mainly includes lecture slides, complete solutions to problems in the book, and some examination papers.
In summary and conclusion, the 3rd edition of "Database Management Systems", by Ramakrishnan and Gehrke, sucks and is it not worth your time or money. This conclusion higly propabilistically holds for all previous editions of the book. A strongly recommended alternative is "Fundamentals of Database Systems" by Elmasri and Navathe.
Oh, and by the way, those quotes (all of which I bothered to read) that the authors have selected to start each chapter of the book with are really silly, irrelevant and meaningless.