I revised this edition to improve readability, update or extend existing topics, add new content, and enhance its educational value. Here is a list of the changes you'll find in this edition:
Much of the text has been rewritten to improve clarity and reader comprehension .
Many of the figures and illustrations have been revised to improve clarity.
New figures and illustrations have been added as warranted by revisions of or additons to existing text.
Discussions of relational database management systems and the relational model in Chapter 1 have both been expanded to include brief content on recent technological advances and general industry direction.
The premise behind the design methodology presented in this book is explained in Chapter 2.
Discussion of nulls and the many-to-many relationship in Chapter 3 have both been expanded to provide greater detail on these subjects.
Web-page-based examples are now included as appropriate in Chapter 6.
Discussions of multivalued fields and the subset tables in Chapter 7 have both been expanded to provide greater detail on these subjects.
The discussion of primary keys in Chapter 8 has been expanded to provide greater detail on this subject.
The Field Specifications sheet has been updated and redesigned for improved flow and readability.
The discussion of the Data Type field specification element in Chapter 9 has been expanded to include an introduction to Structured Query Language (SQL) data types.
Discussions of self-referencing relationships and the Deny, Nullify , and Set Default deletion rules have been added to Chapter 10.
Review questions have been added at the end of Chapters 1 through 12, and the answers to the questions appear in Appendix A.
A flowchart of the design process has been provided as a quick reference tool and is included in Appendix B.
All of the various design guidelines have been compiled in Appendix C.
A glossary has been added to provide a quick reference for various terms used throughout the book.
The accompanying CD includes files in Adobe Acrobat PDF format. These files contain the material in Appendixes B through F.
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