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《數(shù)據(jù)庫(kù)系統(tǒng)概念》是數(shù)據(jù)庫(kù)系統(tǒng)方面的經(jīng)典教材之一，其內(nèi)容由淺入深，既包含數(shù)據(jù)庫(kù)系統(tǒng)基本概念，又反映數(shù)據(jù)庫(kù)技術(shù)新進(jìn)展。本書基于該書第7版進(jìn)行改編，保留其中的基本內(nèi)容，壓縮或刪除了一些高級(jí)內(nèi)容，更加適合作為國(guó)內(nèi)高校計(jì)算機(jī)及相關(guān)專業(yè)本科生數(shù)據(jù)庫(kù)雙語課程教材。

Database management has evolved from a specialized computer application to a central component of a modern computing environment, and, as a result, knowledge about database systems has become an essential part of an education in computer science.
This book is adapted from the seventh edition of Database System Concepts, for a first course in databases at the junior or senior undergraduate level. In this text, we present the fundamental concepts of database management. These concepts include aspects of database design, database languages, and database-system implementation. In addition to basic material for a first course, the text contains advanced material that can be used for course supplements, or as introductory material for an advanced course.
We assume only a familiarity with basic data structures, computer organization, and a high-level programming language such as Java, C, C , or Python. We present concepts as intuitive descriptions, many of which are based on our running example of a university. Important theoretical results are covered, but formal proofs are omitted. In place of proofs, figures and examples are used to suggest why a result is true. Formal descriptions and proofs of theoretical results may be found in research papers and advanced texts that are referenced in the bibliographical notes.
The fundamental concepts and algorithms covered in the book are often based on those used in existing commercial or experimental database systems. Our aim is to present these concepts and algorithms in a general setting that is not tied to one particular database system.
In this adapted text of the seventh edition of Database System Concepts, we have retained essential contents of Database System Concepts, condensed or deleted some of the advanced materials. The purpose is to make this book more suitable for a first course in databases at the undergraduate level. Now we describe organization of this book in brief.
Content of This Book
The text is mainly organized in four parts.
Overview (Chapter 1). Chapter 1 provides a general overview of the nature and purpose of database systems. We explain how the concept of a database system has developed, what the common features of database systems are, what a database system does for the user, and how a database system interfaces with operating systems. We also introduce an example database application: a university organization consisting of multiple departments, instructors, students, and courses. This application is used as a running example throughout the book. This chapter is motivational, historical, and explanatory in nature.
Part 1: Relational Languages (Chapters 2 through 6). Chapter 2 introduces the relational model of data, covering basic concepts such as the structure of relational databases, database schemas, keys, schema diagrams, relational query languages, and relational operations. Chapters 3, 4, and 5 focus on the most influential of the user-oriented relational languages: SQL. Chapter 6 covers the formal relational query languages: relational algebra, tuple relational calculus, domain relational calculus, and Expressive Power of Pure Relational Query Languages.
The chapters in this part describe data manipulation: queries, updates, insertions, and deletions, assuming a schema design has been provided. Schema design issues are deferred to Part 2.
Part 2: Database Design and Application Development(Chapters 7 through 9). Chapter 7 provides an overview of the database-design process, with major emphasis on database design using the entity-relationship data model. The entity-relationship data model provides a high-level view of the issues in database design, and of the problems that we encounter in capturing the semantics of realistic applications within the constraints of a data model. UML class-diagram notation is also covered in this chapter.
Chapter 8 introduces relational database design. The theory of functional dependencies and normalization is covered, with emphasis on the motivation and intuitive understa

Chapter 1　Introduction　1
1.1 Database-System Applications1
1.2 Purpose of Database Systems5
1.3 View of Data8
1.3.1 Data Models8
1.3.2 Relational Data Model9
1.3.3 Data Abstraction9
1.3.4 Instances and Schemas12
1.4 Database Languages　13
1.4.1 Data-Definition Language　13
1.4.2 The SQL Data-Definition Language　14
1.4.3 Data-Manipulation Language　15
1.4.4 The SQL Data-Manipulation Language　16
1.4.5 Database Access from Application Programs　16
1.5 Database Design　17
1.6 Database Engine　18
1.6.1 Storage Manager　19
1.6.2 The Query Processor　20
1.6.3 Transaction Management　20
1.7 Database and Application Architecture　21
1.8 Database Users and Administrators　23
1.8.1 Database Users and User Interfaces　24
1.8.2 Database Administrator　24
1.9 History of Database Systems　25
1.10 Summary　29
Review Terms　30
Practice Exercises　31
Exercises　32
Tools　33
Further Reading　33
Bibliography　33
PART 1　RELATIONAL LANGUAGES
Chapter 2　Introduction to the Relational Model　37
2.1 Structure of Relational Databases37
2.2 Database Schema41
2.3 Keys43
2.4 Schema Diagrams46
2.5 Relational Query Languages47
2.6 Summary48
Review Terms49
Practice Exercises49
Exercises50
Further Reading51
Bibliography51
Chapter 3　Introduction to SQL　53
3.1 Overview of the SQL Query Language53
3.2 SQL Data Definition54
3.2.1 Basic Types55
3.2.2 Basic Schema Definition　56
3.3 Basic Structure of SQL Queries　59
3.3.1 Queries on a Single Relation　59
3.3.2 Queries on Multiple Relations　62
3.4 Additional Basic Operations　67
3.4.1 The Rename Operation　67
3.4.2 String Operations　70
3.4.3 Attribute Specification in the Select Clause　71
3.4.4 Ordering the Display of Tuples　71
3.4.5 Where-Clause Predicates　72
3.5 Set Operations　73
3.5.1 The Union Operation　74
3.5.2 The Intersect Operation　75
3.5.3 The Except Operation　76
3.6 Null Values　77
3.7 Aggregate Functions　79
3.7.1 Basic Aggregation　79
3.7.2 Aggregation with Grouping　80
3.7.3 The Having Clause　83
3.7.4 Aggregation with Null and Boolean Values　84
3.8 Nested Subqueries　86
3.8.1 Set Membership　86
3.8.2 Set Comparison　87
3.8.3 Test for Empty Relations　89
3.8.4 Test for the Absence of Duplicate Tuples　91
3.8.5 Subqueries in the From Clause　92
3.8.6 The With Clause　93
3.8.7 Scalar Subqueries　94
3.8.8 Scalar Without a From Clause　95
3.9 Modification of the Database　96
3.9.1 Deletion　96
3.9.2 Insertion　98
3.9.3 Updates　99
3.10 Summary　102
Review Terms　103
Practice Exercises　103
Exercises　107
Tools　111
Further Reading　112
Bibliography　112
Chapter 4　Intermediate SQL　113
4.1 Join Expressions113
4.1.1 The Natural Join114
4.1.2 Join Conditions118
4.1.3 Outer Joins119
4.1.4 Join Types and Conditions124
4.2 Views125
4.2.1 View Definition126
4.2.2 Using Views in SQL Queries126
4.2.3 Materialized Views128
4.2.4 Update of a View128
4.3 Transactions131
4.4 Integrity Constraints133
4.4.1 Constraints on a Single Relation134
4.4.2 Not Null Constraint134
4.4.3 Unique Constraint135
4.4.4 The Check Clause135
4.4.5 Referential Integrity137
4.4.6 Assigning Names to Constraints139
4.4.7 Integrity Constraint Violation During a Transaction139
4.4.8 Complex Check Conditions and Assertions　140
4.5 SQL Data Types and Schemas　141
4.5.1 Date and Time Types in SQL　142
4.5.2 Type Conversion and Formatting Functions　143
4.5.3 Default Values　144
4.5.4 Large-Object Types　144
4.5.5 User-Defined Types　146
4.5.6 Generating Unique Key Values　148
4.5.7 Create Table Extensions　150
4.5.8 Schemas, Catalogs, and Environments　150
4.6 Index Definition in SQL　152
4.7 Authorization　153
4.7.1 Granting and Revoking of Privile

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