文档介绍：Relational
Database Design
Clearly
xolained
Second Edition
This Page Intentionally Left Blank
Relational
DatabaseDes n
Clea
xplained
Second Edition
Jan L. Harrington
Morgan Kaufmann Publishers
An Imprint of Elsevier
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This book is printed on acid-free paper.
Copyright
9 2002, 1999, Elsevier.
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Library of Congress Catalog Card Number: 2002101250
ISBN-10:1-55860-820-6
ISBN-13:978-1-55860-820-7
Printed in the United States of America
05 06 07 MV 9 8 7 6 5 4
Contents
Preface to the Second Edition xiii
What You Need to Know xv
Acknowledgments xv
Part One: Theory
Chapter 1"Introduction 3
Effects of Poor Database Design 4
Unnecessary Duplicated Data and Data Consistency 6
Data Insertion Problems 7
Data Deletion Problems 8
Meaningful Identifiers 9
What You Will Find in This Book 9
vi CONTENTS
Chapter 2: Entit