In many cases, a subquery can be restated as a/an ______________.

FUNDAMENTALS OF

Database Systems SIXTH EDITION

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FUNDAMENTALS OF

Database Systems SIXTH EDITION

Ramez Elmasri Department of Computer Science and Engineering The University of Texas at Arlington

Shamkant B. Navathe College of Computing Georgia Institute of Technology

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Many of the designations by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and the publisher was aware of a trademark claim, the designations have been printed in initial caps or all caps.

Library of Congress Cataloging-in-Publication Data

Elmasri, Ramez. Fundamentals of database systems / Ramez Elmasri, Shamkant B. Navathe.—6th ed.

p. cm. Includes bibliographical references and index. ISBN-13: 978-0-136-08620-8

1. Database management. I. Navathe, Sham. II. Title.

QA76.9.D3E57 2010 005.74—dc22Addison-Wesley

is an imprint of

10 9 8 7 6 5 4 3 2 1—CW—14 13 12 11 10 ISBN 10: 0-136-08620-9 ISBN 13: 978-0-136-08620-8

To Katrina, Thomas, and Dora (and also to Ficky)

R. E.

To my wife Aruna, mother Vijaya, and to my entire family

for their love and support

S.B.N.

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vii

This book introduces the fundamental concepts nec-essary for designing, using, and implementing database systems and database applications. Our presentation stresses the funda- mentals of database modeling and design, the languages and models provided by the database management systems, and database system implementation tech- niques. The book is meant to be used as a textbook for a one- or two-semester course in database systems at the junior, senior, or graduate level, and as a reference book. Our goal is to provide an in-depth and up-to-date presentation of the most important aspects of database systems and applications, and related technologies. We assume that readers are familiar with elementary programming and data- structuring concepts and that they have had some exposure to the basics of com- puter organization.

New to This Edition The following key features have been added in the sixth edition:

■ A reorganization of the chapter ordering to allow instructors to start with projects and laboratory exercises very early in the course

■ The material on SQL, the relational database standard, has been moved early in the book to Chapters 4 and 5 to allow instructors to focus on this impor- tant topic at the beginning of a course

■ The material on object-relational and object-oriented databases has been updated to conform to the latest SQL and ODMG standards, and consoli- dated into a single chapter (Chapter 11)

■ The presentation of XML has been expanded and updated, and moved ear- lier in the book to Chapter 12

■ The chapters on normalization theory have been reorganized so that the first chapter (Chapter 15) focuses on intuitive normalization concepts, while the second chapter (Chapter 16) focuses on the formal theories and normaliza- tion algorithms

■ The presentation of database security threats has been updated with a dis- cussion on SQL injection attacks and prevention techniques in Chapter 24, and an overview of label-based security with examples

Preface

■ Our presentation on spatial databases and multimedia databases has been expanded and updated in Chapter 26

■ A new Chapter 27 on information retrieval techniques has been added, which discusses models and techniques for retrieval, querying, browsing, and indexing of information from Web documents; we present the typical processing steps in an information retrieval system, the evaluation metrics, and how information retrieval techniques are related to databases and to Web search

The following are key features of the book:

■ A self-contained, flexible organization that can be tailored to individual needs

■ A Companion Website (http://www.aw.com/elmasri) includes data to be loaded into various types of relational databases for more realistic student laboratory exercises

■ A simple relational algebra and calculus interpreter

■ A collection of supplements, including a robust set of materials for instruc- tors and students, such as PowerPoint slides, figures from the text, and an instructor’s guide with solutions

Organization of the Sixth Edition There are significant organizational changes in the sixth edition, as well as improve- ment to the individual chapters. The book is now divided into eleven parts as follows:

■ Part 1 (Chapters 1 and 2) includes the introductory chapters

■ The presentation on relational databases and SQL has been moved to Part 2 (Chapters 3 through 6) of the book; Chapter 3 presents the formal relational model and relational database constraints; the material on SQL (Chapters 4 and 5) is now presented before our presentation on relational algebra and cal- culus in Chapter 6 to allow instructors to start SQL projects early in a course if they wish (this reordering is also based on a study that suggests students master SQL better when it is taught before the formal relational languages)

■ The presentation on entity-relationship modeling and database design is now in Part 3 (Chapters 7 through 10), but it can still be covered before Part 2 if the focus of a course is on database design

■ Part 4 covers the updated material on object-relational and object-oriented databases (Chapter 11) and XML (Chapter 12)

■ Part 5 includes the chapters on database programming techniques (Chapter 13) and Web database programming using PHP (Chapter 14, which was moved earlier in the book)

■ Part 6 (Chapters 15 and 16) are the normalization and design theory chapters (we moved all the formal aspects of normalization algorithms to Chapter 16)

viii Preface

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Preface ix

■ Part 7 (Chapters 17 and 18) contains the chapters on file organizations, indexing, and hashing

■ Part 8 includes the chapters on query processing and optimization tech- niques (Chapter 19) and database tuning (Chapter 20)

■ Part 9 includes Chapter 21 on transaction processing concepts; Chapter 22 on concurrency control; and Chapter 23 on database recovery from failures

■ Part 10 on additional database topics includes Chapter 24 on database secu- rity and Chapter 25 on distributed databases

■ Part 11 on advanced database models and applications includes Chapter 26 on advanced data models (active, temporal, spatial, multimedia, and deduc- tive databases); the new Chapter 27 on information retrieval and Web search; and the chapters on data mining (Chapter 28) and data warehousing (Chapter 29)

Contents of the Sixth Edition Part 1 describes the basic introductory concepts necessary for a good understanding of database models, systems, and languages. Chapters 1 and 2 introduce databases, typical users, and DBMS concepts, terminology, and architecture.

Part 2 describes the relational data model, the SQL standard, and the formal rela- tional languages. Chapter 3 describes the basic relational model, its integrity con- straints, and update operations. Chapter 4 describes some of the basic parts of the SQL standard for relational databases, including data definition, data modification operations, and simple SQL queries. Chapter 5 presents more complex SQL queries, as well as the SQL concepts of triggers, assertions, views, and schema modification. Chapter 6 describes the operations of the relational algebra and introduces the rela- tional calculus.

Part 3 covers several topics related to conceptual database modeling and database design. In Chapter 7, the concepts of the Entity-Relationship (ER) model and ER diagrams are presented and used to illustrate conceptual database design. Chapter 8 focuses on data abstraction and semantic data modeling concepts and shows how the ER model can be extended to incorporate these ideas, leading to the enhanced- ER (EER) data model and EER diagrams. The concepts presented in Chapter 8 include subclasses, specialization, generalization, and union types (categories). The notation for the class diagrams of UML is also introduced in Chapters 7 and 8. Chapter 9 discusses relational database design using ER- and EER-to-relational mapping. We end Part 3 with Chapter 10, which presents an overview of the differ- ent phases of the database design process in enterprises for medium-sized and large database applications.

Part 4 covers the object-oriented, object-relational, and XML data models, and their affiliated languages and standards. Chapter 11 first introduces the concepts for object databases, and then shows how they have been incorporated into the SQL standard in order to add object capabilities to relational database systems. It then

x Preface

covers the ODMG object model standard, and its object definition and query lan- guages. Chapter 12 covers the XML (eXtensible Markup Language) model and lan- guages, and discusses how XML is related to database systems. It presents XML concepts and languages, and compares the XML model to traditional database models. We also show how data can be converted between the XML and relational representations.

Part 5 is on database programming techniques. Chapter 13 covers SQL program- ming topics, such as embedded SQL, dynamic SQL, ODBC, SQLJ, JDBC, and SQL/CLI. Chapter 14 introduces Web database programming, using the PHP script- ing language in our examples.

Part 6 covers normalization theory. Chapters 15 and 16 cover the formalisms, theo- ries, and algorithms developed for relational database design by normalization. This material includes functional and other types of dependencies and normal forms of relations. Step-by-step intuitive normalization is presented in Chapter 15, which also defines multivalued and join dependencies. Relational design algorithms based on normalization, along with the theoretical materials that the algorithms are based on, are presented in Chapter 16.

Part 7 describes the physical file structures and access methods used in database sys- tems. Chapter 17 describes primary methods of organizing files of records on disk, including static and dynamic hashing. Chapter 18 describes indexing techniques for files, including B-tree and B+-tree data structures and grid files.

Part 8 focuses on query processing and database performance tuning. Chapter 19 introduces the basics of query processing and optimization, and Chapter 20 dis- cusses physical database design and tuning.

Part 9 discusses transaction processing, concurrency control, and recovery tech- niques, including discussions of how these concepts are realized in SQL. Chapter 21 introduces the techniques needed for transaction processing systems, and defines the concepts of recoverability and serializability of schedules. Chapter 22 gives an overview of the various types of concurrency control protocols, with a focus on two-phase locking. We also discuss timestamp ordering and optimistic concurrency control techniques, as well as multiple-granularity locking. Finally, Chapter 23 focuses on database recovery protocols, and gives an overview of the concepts and techniques that are used in recovery.

Parts 10 and 11 cover a number of advanced topics. Chapter 24 gives an overview of database security including the discretionary access control model with SQL com- mands to GRANT and REVOKE privileges, the mandatory access control model with user categories and polyinstantiation, a discussion of data privacy and its rela- tionship to security, and an overview of SQL injection attacks. Chapter 25 gives an introduction to distributed databases and discusses the three-tier client/server architecture. Chapter 26 introduces several enhanced database models for advanced applications. These include active databases and triggers, as well as temporal, spa- tial, multimedia, and deductive databases. Chapter 27 is a new chapter on informa- tion retrieval techniques, and how they are related to database systems and to Web

search methods. Chapter 28 on data mining gives an overview of the process of data mining and knowledge discovery, discusses algorithms for association rule mining, classification, and clustering, and briefly covers other approaches and commercial tools. Chapter 29 introduces data warehousing and OLAP concepts.

Appendix A gives a number of alternative diagrammatic notations for displaying a conceptual ER or EER schema. These may be substituted for the notation we use, if the instructor prefers. Appendix B gives some important physical parameters of disks. Appendix C gives an overview of the QBE graphical query language. Appen- dixes D and E (available on the book’s Companion Website located at http://www.aw.com/elmasri) cover legacy database systems, based on the hierar- chical and network database models. They have been used for more than thirty years as a basis for many commercial database applications and transaction- processing systems. We consider it important to expose database management stu- dents to these legacy approaches so they can gain a better insight of how database technology has progressed.

Guidelines for Using This Book There are many different ways to teach a database course. The chapters in Parts 1 through 7 can be used in an introductory course on database systems in the order that they are given or in the preferred order of individual instructors. Selected chap- ters and sections may be left out, and the instructor can add other chapters from the rest of the book, depending on the emphasis of the course. At the end of the open- ing section of many of the book’s chapters, we list sections that are candidates for being left out whenever a less-detailed discussion of the topic is desired. We suggest covering up to Chapter 15 in an introductory database course and including selected parts of other chapters, depending on the background of the students and the desired coverage. For an emphasis on system implementation techniques, chap- ters from Parts 7, 8, and 9 should replace some of the earlier chapters.

Chapters 7 and 8, which cover conceptual modeling using the ER and EER models, are important for a good conceptual understanding of databases. However, they may be partially covered, covered later in a course, or even left out if the emphasis is on DBMS implementation. Chapters 17 and 18 on file organizations and indexing may also be covered early, later, or even left out if the emphasis is on database mod- els and languages. For students who have completed a course on file organization, parts of these chapters can be assigned as reading material or some exercises can be assigned as a review for these concepts.

If the emphasis of a course is on database design, then the instructor should cover Chapters 7 and 8 early on, followed by the presentation of relational databases. A total life-cycle database design and implementation project would cover conceptual design (Chapters 7 and 8), relational databases (Chapters 3, 4, and 5), data model mapping (Chapter 9), normalization (Chapter 15), and application programs implementation with SQL (Chapter 13). Chapter 14 also should be covered if the emphasis is on Web database programming and applications. Additional documen- tation on the specific programming languages and RDBMS used would be required.

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The book is written so that it is possible to cover topics in various sequences. The chapter dependency chart below shows the major dependencies among chapters. As the diagram illustrates, it is possible to start with several different topics following the first two introductory chapters. Although the chart may seem complex, it is important to note that if the chapters are covered in order, the dependencies are not lost. The chart can be consulted by instructors wishing to use an alternative order of presentation.

For a one-semester course based on this book, selected chapters can be assigned as reading material. The book also can be used for a two-semester course sequence. The first course, Introduction to Database Design and Database Systems, at the soph- omore, junior, or senior level, can cover most of Chapters 1 through 15. The second course, Database Models and Implementation Techniques, at the senior or first-year graduate level, can cover most of Chapters 16 through 29. The two-semester sequence can also been designed in various other ways, depending on the prefer- ences of the instructors.

xii Preface

1, 2 Introductory

7, 8 ER, EER Models

3 Relational

Model

6 Relational Algebra 13, 14

DB, Web Programming

9 ER--, EER-to-

Relational

17, 18 File Organization,

Indexing

28, 29 Data Mining, Warehousing

24, 25 Security,

DDB

10 DB Design,

UML

21, 22, 23 Transactions, CC, Recovery

11, 12 ODB, ORDB,

XML

4, 5 SQL

26, 27 Advanced Models,

IR

15, 16 FD, MVD,

Normalization

19, 20 Query Processing,

Optimization, DB Tuning

Supplemental Materials Support material is available to all users of this book and additional material is available to qualified instructors.

■ PowerPoint lecture notes and figures are available at the Computer Science support Website at http://www.aw.com/cssupport.

■ A lab manual for the sixth edition is available through the Companion Web- site (http://www.aw.com/elmasri). The lab manual contains coverage of popular data modeling tools, a relational algebra and calculus interpreter, and examples from the book implemented using two widely available data- base management systems. Select end-of-chapter laboratory problems in the book are correlated to the lab manual.

■ A solutions manual is available to qualified instructors. Visit Addison- Wesley’s instructor resource center (http://www.aw.com/irc), contact your local Addison-Wesley sales representative, or e-mail computing@aw.com for information about how to access the solutions.

Additional Support Material Gradiance, an online homework and tutorial system that provides additional prac- tice and tests comprehension of important concepts, is available to U.S. adopters of this book. For more information, please e-mail computing@aw.com or contact your local Pearson representative.

Acknowledgments It is a great pleasure to acknowledge the assistance and contributions of many indi- viduals to this effort. First, we would like to thank our editor, Matt Goldstein, for his guidance, encouragement, and support. We would like to acknowledge the excellent work of Gillian Hall for production management and Rebecca Greenberg for a thorough copy editing of the book. We thank the following persons from Pearson who have contributed to the sixth edition: Jeff Holcomb, Marilyn Lloyd, Margaret Waples, and Chelsea Bell.

Sham Navathe would like to acknowledge the significant contribution of Saurav Sahay to Chapter 27. Several current and former students also contributed to vari- ous chapters in this edition: Rafi Ahmed, Liora Sahar, Fariborz Farahmand, Nalini Polavarapu, and Wanxia Xie (former students); and Bharath Rengarajan, Narsi Srinivasan, Parimala R. Pranesh, Neha Deodhar, Balaji Palanisamy and Hariprasad Kumar (current students). Discussions with his colleagues Ed Omiecinski and Leo Mark at Georgia Tech and Venu Dasigi at SPSU, Atlanta have also contributed to the revision of the material.

We would like to repeat our thanks to those who have reviewed and contributed to previous editions of Fundamentals of Database Systems.

■ First edition. Alan Apt (editor), Don Batory, Scott Downing, Dennis Heimbinger, Julia Hodges, Yannis Ioannidis, Jim Larson, Per-Ake Larson,

Preface xiii

http://www.aw.com/cssupport

http://www.aw.com/elmasri

http://www.aw.com/irc

Dennis McLeod, Rahul Patel, Nicholas Roussopoulos, David Stemple, Michael Stonebraker, Frank Tompa, and Kyu-Young Whang.

■ Second edition. Dan Joraanstad (editor), Rafi Ahmed, Antonio Albano, David Beech, Jose Blakeley, Panos Chrysanthis, Suzanne Dietrich, Vic Ghor- padey, Goetz Graefe, Eric Hanson, Junguk L. Kim, Roger King, Vram Kouramajian, Vijay Kumar, John Lowther, Sanjay Manchanda, Toshimi Minoura, Inderpal Mumick, Ed Omiecinski, Girish Pathak, Raghu Ramakr- ishnan, Ed Robertson, Eugene Sheng, David Stotts, Marianne Winslett, and Stan Zdonick.

■ Third edition. Maite Suarez-Rivas and Katherine Harutunian (editors); Suzanne Dietrich, Ed Omiecinski, Rafi Ahmed, Francois Bancilhon, Jose Blakeley, Rick Cattell, Ann Chervenak, David W. Embley, Henry A. Etlinger, Leonidas Fegaras, Dan Forsyth, Farshad Fotouhi, Michael Franklin, Sreejith Gopinath, Goetz Craefe, Richard Hull, Sushil Jajodia, Ramesh K. Karne, Harish Kotbagi, Vijay Kumar, Tarcisio Lima, Ramon A. Mata-Toledo, Jack McCaw, Dennis McLeod, Rokia Missaoui, Magdi Morsi, M. Narayanaswamy, Carlos Ordonez, Joan Peckham, Betty Salzberg, Ming-Chien Shan, Junping Sun, Rajshekhar Sunderraman, Aravindan Veerasamy, and Emilia E. Villareal.

■ Fourth edition. Maite Suarez-Rivas, Katherine Harutunian, Daniel Rausch, and Juliet Silveri (editors); Phil Bernhard, Zhengxin Chen, Jan Chomicki, Hakan Ferhatosmanoglu, Len Fisk, William Hankley, Ali R. Hurson, Vijay Kumar, Peretz Shoval, Jason T. L. Wang (reviewers); Ed Omiecinski (who contributed to Chapter 27). Contributors from the University of Texas at Arlington are Jack Fu, Hyoil Han, Babak Hojabri, Charley Li, Ande Swathi, and Steven Wu; Contributors from Georgia Tech are Weimin Feng, Dan Forsythe, Angshuman Guin, Abrar Ul-Haque, Bin Liu, Ying Liu, Wanxia Xie, and Waigen Yee.

■ Fifth edition. Matt Goldstein and Katherine Harutunian (editors); Michelle Brown, Gillian Hall, Patty Mahtani, Maite Suarez-Rivas, Bethany Tidd, and Joyce Cosentino Wells (from Addison-Wesley); Hani Abu-Salem, Jamal R. Alsabbagh, Ramzi Bualuan, Soon Chung, Sumali Conlon, Hasan Davulcu, James Geller, Le Gruenwald, Latifur Khan, Herman Lam, Byung S. Lee, Donald Sanderson, Jamil Saquer, Costas Tsatsoulis, and Jack C. Wileden (reviewers); Raj Sunderraman (who contributed the laboratory projects); Salman Azar (who contributed some new exercises); Gaurav Bhatia, Fariborz Farahmand, Ying Liu, Ed Omiecinski, Nalini Polavarapu, Liora Sahar, Saurav Sahay, and Wanxia Xie (from Georgia Tech).

Last, but not least, we gratefully acknowledge the support, encouragement, and patience of our families.

R. E.

S.B.N.

xiv Preface

Contents

■ part 1 Introduction to Databases ■

chapter 1 Databases and Database Users 3 1.1 Introduction 4 1.2 An Example 6 1.3 Characteristics of the Database Approach 9 1.4 Actors on the Scene 14 1.5 Workers behind the Scene 16 1.6 Advantages of Using the DBMS Approach 17 1.7 A Brief History of Database Applications 23 1.8 When Not to Use a DBMS 26 1.9 Summary 27 Review Questions 27 Exercises 28 Selected Bibliography 28

chapter 2 Database System Concepts and Architecture 29

2.1 Data Models, Schemas, and Instances 30 2.2 Three-Schema Architecture and Data Independence 33 2.3 Database Languages and Interfaces 36 2.4 The Database System Environment 40 2.5 Centralized and Client/Server Architectures for DBMSs 44 2.6 Classification of Database Management Systems 49 2.7 Summary 52 Review Questions 53 Exercises 54 Selected Bibliography 55

xv

xvi Contents

■ part 2 The Relational Data Model and SQL ■

chapter 3 The Relational Data Model and Relational Database Constraints 59

3.1 Relational Model Concepts 60 3.2 Relational Model Constraints and Relational Database Schemas 67 3.3 Update Operations, Transactions, and Dealing

with Constraint Violations 75 3.4 Summary 79 Review Questions 80 Exercises 80 Selected Bibliography 85

chapter 4 Basic SQL 87 4.1 SQL Data Definition and Data Types 89 4.2 Specifying Constraints in SQL 94 4.3 Basic Retrieval Queries in SQL 97 4.4 INSERT, DELETE, and UPDATE Statements in SQL 107 4.5 Additional Features of SQL 110 4.6 Summary 111 Review Questions 112 Exercises 112 Selected Bibliography 114

chapter 5 More SQL: Complex Queries, Triggers, Views, and Schema Modification 115

5.1 More Complex SQL Retrieval Queries 115 5.2 Specifying Constraints as Assertions and Actions as Triggers 131 5.3 Views (Virtual Tables) in SQL 133 5.4 Schema Change Statements in SQL 137 5.5 Summary 139 Review Questions 141 Exercises 141 Selected Bibliography 143

chapter 6 The Relational Algebra and Relational Calculus 145

6.1 Unary Relational Operations: SELECT and PROJECT 147 6.2 Relational Algebra Operations from Set Theory 152 6.3 Binary Relational Operations: JOIN and DIVISION 157 6.4 Additional Relational Operations 165 6.5 Examples of Queries in Relational Algebra 171 6.6 The Tuple Relational Calculus 174 6.7 The Domain Relational Calculus 183 6.8 Summary 185 Review Questions 186 Exercises 187 Laboratory Exercises 192 Selected Bibliography 194

■ part 3 Conceptual Modeling and Database Design ■

chapter 7 Data Modeling Using the Entity-Relationship (ER) Model 199

7.1 Using High-Level Conceptual Data Models for Database Design 200 7.2 A Sample Database Application 202 7.3 Entity Types, Entity Sets, Attributes, and Keys 203 7.4 Relationship Types, Relationship Sets, Roles,

and Structural Constraints 212 7.5 Weak Entity Types 219 7.6 Refining the ER Design for the COMPANY Database 220 7.7 ER Diagrams, Naming Conventions, and Design Issues 221 7.8 Example of Other Notation: UML Class Diagrams 226 7.9 Relationship Types of Degree Higher than Two 228 7.10 Summary 232 Review Questions 234 Exercises 234 Laboratory Exercises 241 Selected Bibliography 243

Contents xvii

xviii Contents

chapter 8 The Enhanced Entity-Relationship (EER) Model 245

8.1 Subclasses, Superclasses, and Inheritance 246 8.2 Specialization and Generalization 248 8.3 Constraints and Characteristics of Specialization

and Generalization Hierarchies 251 8.4 Modeling of UNION Types Using Categories 258 8.5 A Sample UNIVERSITY EER Schema, Design Choices,

and Formal Definitions 260 8.6 Example of Other Notation: Representing Specialization

and Generalization in UML Class Diagrams 265 8.7 Data Abstraction, Knowledge Representation,

and Ontology Concepts 267 8.8 Summary 273 Review Questions 273 Exercises 274 Laboratory Exercises 281 Selected Bibliography 284

chapter 9 Relational Database Design by ER- and EER-to-Relational Mapping 285

9.1 Relational Database Design Using ER-to-Relational Mapping 286 9.2 Mapping EER Model Constructs to Relations 294 9.3 Summary 299 Review Questions 299 Exercises 299 Laboratory Exercises 301 Selected Bibliography 302

chapter 10 Practical Database Design Methodology and Use of UML Diagrams 303

10.1 The Role of Information Systems in Organizations 304 10.2 The Database Design and Implementation Process 309 10.3 Use of UML Diagrams as an Aid to Database

Design Specification 328 10.4 Rational Rose: A UML-Based Design Tool 337 10.5 Automated Database Design Tools 342

Contents xix

10.6 Summary 345 Review Questions 347 Selected Bibliography 348

■ part 4 Object, Object-Relational, and XML: Concepts, Models, Languages, and Standards ■

chapter 11 Object and Object-Relational Databases 353 11.1 Overview of Object Database Concepts 355 11.2 Object-Relational Features: Object Database Extensions

to SQL 369 11.3 The ODMG Object Model and the Object Definition

Language ODL 376 11.4 Object Database Conceptual Design 395 11.5 The Object Query Language OQL 398 11.6 Overview of the C++ Language Binding in the ODMG Standard 407 11.7 Summary 408 Review Questions 409 Exercises 411 Selected Bibliography 412

chapter 12 XML: Extensible Markup Language 415 12.1 Structured, Semistructured, and Unstructured Data 416 12.2 XML Hierarchical (Tree) Data Model 420 12.3 XML Documents, DTD, and XML Schema 423 12.4 Storing and Extracting XML Documents from Databases 431 12.5 XML Languages 432 12.6 Extracting XML Documents from Relational Databases 436 12.7 Summary 442 Review …

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