| Summary: | 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.
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