View Updating And Relational Theory

View Updating and Relational Theory PDF
Author: Chris Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449357849
Size: 34.93 MB
Format: PDF, Kindle
Category : Computers
Languages : en
Pages : 240
View: 2837

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Views are virtual tables. That means they should be updatable, just as "real" or base tables are. In fact, view updatability isn’t just desirable, it’s crucial, for practical reasons as well as theoretical ones. But view updating has always been a controversial topic. Ever since the relational model first appeared, there has been widespread skepticism as to whether (in general) view updating is even possible. In stark contrast to this conventional wisdom, this book shows how views, just like base tables, can always be updated (so long as the updates don’t violate any integrity constraints). More generally, it shows how updating always ought to work, regardless of whether the target is a base table or a view. The proposed scheme is 100% consistent with the relational model, but rather different from the way updating works in SQL products today. This book can: Help database products improve in the future Help with a "roll your own" implementation, absent such product improvements Make you aware of the crucial role of predicates and constraints Show you how relational products are really supposed to behave Anyone with a professional interest in the relational model, relational technology, or database systems in general can benefit from this book.

Relational Theory For Computer Professionals

Relational Theory for Computer Professionals PDF
Author: C.J. Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449369456
Size: 60.95 MB
Format: PDF, ePub
Category : Computers
Languages : en
Pages : 284
View: 1158

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All of today’s mainstream database products support the SQL language, and relational theory is what SQL is supposed to be based on. But are those products truly relational? Sadly, the answer is no. This book shows you what a real relational product would be like, and how and why it would be so much better than what’s currently available. With this unique book, you will: Learn how to see database systems as programming systems Get a careful, precise, and detailed definition of the relational model Explore a detailed analysis of SQL from a relational point of view There are literally hundreds of books on relational theory or the SQL language or both. But this one is different. First, nobody is more qualified than Chris Date to write such a book. He and Ted Codd, inventor of the relational model, were colleagues for many years, and Chris’s involvement with the technology goes back to the time of Codd’s first papers in 1969 and 1970. Second, most books try to use SQL as a vehicle for teaching relational theory, but this book deliberately takes the opposite approach. Its primary aim is to teach relational theory as such. Then it uses that theory as a vehicle for teaching SQL, showing in particular how that theory can help with the practical problem of using SQL correctly and productively. Any computer professional who wants to understand what relational systems are all about can benefit from this book. No prior knowledge of databases is assumed.

Sql And Relational Theory

SQL and Relational Theory PDF
Author: C.J. Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1491941154
Size: 49.85 MB
Format: PDF, Mobi
Category : Computers
Languages : en
Pages : 582
View: 2190

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SQL is full of difficulties and traps for the unwary. You can avoid them if you understand relational theory, but only if you know how to put that theory into practice. In this book, Chris Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it to your use of SQL. This third edition has been revised, extended, and improved throughout. Topics whose treatment has been expanded include data types and domains, table comparisons, image relations, aggregate operators and summarization, view updating, and subqueries. A special feature of this edition is a new appendix on NoSQL and relational theory. Could you write an SQL query to find employees who have worked at least once in every programming department in the company? And be sure it’s correct? Why is proper column naming so important? Nulls in the database cause wrong answers. Why? What you can do about it? How can image relations help you formulate complex SQL queries? SQL supports "quantified comparisons," but they’re better avoided. Why? And how? Database theory and practice have evolved considerably since Codd first defined the relational model, back in 1969. This book draws on decades of experience to present the most up to date treatment of the material available anywhere. Anyone with a modest to advanced background in SQL can benefit from the insights it contains. The book is product independent.

E F Codd And Relational Theory A Detailed Review And Analysis Of Codd S Major Database Writings

E  F  Codd and Relational Theory  A Detailed Review and Analysis of Codd  s Major Database Writings PDF
Author: C. J. Date
Publisher: Lulu.com
ISBN: 1684705274
Size: 14.51 MB
Format: PDF, Kindle
Category : Database management
Languages : en
Pages : 304
View: 6207

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E. F. Codd's relational model of data has been described as one of the three greatest inventions of all time (the other two being agriculture and the scientific method), and his receipt of the 1981 ACM Turing Award?the top award in computer science?for inventing it was thoroughly deserved. The papers in which Codd first described his model were staggering in their originality; they had, and continue to have, a huge impact on just about every aspect of the way we do business in the world today. And yet few people, even in the professional database community, are truly familiar with those papers. This book is an attempt to remedy this sorry state of affairs. In it, well known author C. J. Date provides a detailed examination of all of Codd's major technical publications, explaining the nature of his contribution in depth, and in particular highlighting not only the many things he got right but also some of the things he got wrong.

Entity Relationship Approach Er 92

Entity Relationship Approach   ER  92 PDF
Author: Günther Pernul
Publisher: Springer Science & Business Media
ISBN: 9783540560234
Size: 48.12 MB
Format: PDF, ePub, Mobi
Category : Computers
Languages : en
Pages : 439
View: 1194

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This volume comprises the proceedings of the Eleventh International Conference on the Entity-Relationship Approach held in Karlsruhe, Germany, October 7-9, 1992. It contains the full versions of all the 22 accepted papers selected from in total 64 submissions; in addition, the two invited talks by Scheer and by Tsichritzis and others are represented asfull papers and the two other invited speakers contribute extended abstracts. All the contributions describe original research related to theoretical or practical aspects of the Entity-Relationship Approach,reflecting the trend of recent years in a wide range of database research activities. In particular, the topics database design aspects, object-orientation, integrity constraints, query languages, knowledge-based techniques, and development of new applications are addressed.

Sql And Relational Theory

SQL and Relational Theory PDF
Author: C. Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449316409
Size: 59.61 MB
Format: PDF, Docs
Category : Computers
Languages : en
Pages : 428
View: 3516

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SQL is full of difficulties and traps for the unwary. You can avoid them if you understand relational theory, but only if you know how to put the theory into practice. In this insightful book, author C.J. Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it directly to your use of SQL. This second edition includes new material on recursive queries, “missing information” without nulls, new update operators, and topics such as aggregate operators, grouping and ungrouping, and view updating. If you have a modest-to-advanced background in SQL, you’ll learn how to deal with a host of common SQL dilemmas. Why is proper column naming so important? Nulls in your database are causing you to get wrong answers. Why? What can you do about it? Is it possible to write an SQL query to find employees who have never been in the same department for more than six months at a time? SQL supports “quantified comparisons,” but they’re better avoided. Why? How do you avoid them? Constraints are crucially important, but most SQL products don’t support them properly. What can you do to resolve this situation? Database theory and practice have evolved since the relational model was developed more than 40 years ago. SQL and Relational Theory draws on decades of research to present the most up-to-date treatment of SQL available. C.J. Date has a stature that is unique within the database industry. A prolific writer well known for the bestselling textbook An Introduction to Database Systems (Addison-Wesley), he has an exceptionally clear style when writing about complex principles and theory.

Logic And Databases

Logic and Databases PDF
Author: C. J. Date
Publisher: Trafford Publishing
ISBN: 1425122906
Size: 31.35 MB
Format: PDF, Docs
Category : Computers
Languages : en
Pages : 445
View: 5350

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Databases are based on logic - right? Everybody knows that. Or do they? Chris Date's most recent book explores the myriad ways in which logic affects the database world.

Database In Depth

Database in Depth PDF
Author: C.J. Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449342647
Size: 27.55 MB
Format: PDF, Mobi
Category : Computers
Languages : en
Pages : 232
View: 7590

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This book sheds light on the principles behind the relational model, which is fundamental to all database-backed applications--and, consequently, most of the work that goes on in the computing world today. Database in Depth: The Relational Model for Practitioners goes beyond the hype and gets to the heart of how relational databases actually work.Ideal for experienced database developers and designers, this concise guide gives you a clear view of the technology--a view that's not influenced by any vendor or product. Featuring an extensive set of exercises, it will help you: understand why and how the relational model is still directly relevant to modern database technology (and will remain so for the foreseeable future) see why and how the SQL standard is seriously deficient use the best current theoretical knowledge in the design of their databases and database applications make informed decisions in their daily database professional activities Database in Depth will appeal not only to database developers and designers, but also to a diverse field of professionals and academics, including database administrators (DBAs), information modelers, database consultants, and more. Virtually everyone who deals with relational databases should have at least a passing understanding of the fundamentals of working with relational models.Author C.J. Date has been involved with the relational model from its earliest days. An exceptionally clear-thinking writer, Date lays out principle and theory in a manner that is easily understood. Few others can speak as authoritatively the topic of relational databases as Date can.

A Guided Tour Of Relational Databases And Beyond

A Guided Tour of Relational Databases and Beyond PDF
Author: Mark Levene
Publisher: Springer Science & Business Media
ISBN: 9781852330088
Size: 29.44 MB
Format: PDF, Docs
Category : Computers
Languages : en
Pages : 625
View: 5084

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Addressing important extensions of the relational database model, including deductive, temporal, and object-oriented databases, this book provides an overview of database modeling with the Entity-Relationship (ER) model and the relational model. The book focuses on the primary achievements in relational database theory, including query languages, integrity constraints, database design, computable queries, and concurrency control. This reference will shed light on the ideas underlying relational database systems and the problems that confront database designers and researchers.

Sql And Relational Theory 2nd Edition

SQL and Relational Theory  2nd Edition PDF
Author: C. J. Date
Publisher:
ISBN:
Size: 42.78 MB
Format: PDF, ePub, Docs
Category : Database management
Languages : en
Pages : 444
View: 4064

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SQL is full of difficulties and traps for the unwary. You can avoid them if you understand relational theory, but only if you know how to put the theory into practice. In this insightful book, author C.J. Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it directly to your use of SQL. This second edition includes new material on recursive queries, "missing information" without nulls, new update operators, and topics such as aggregate operators, grouping and ungrouping, and view updating. If you have a modest-to-advanced background in SQL, you'll learn how to deal with a host of common SQL dilemmas. Why is proper column naming so important? Nulls in your database are causing you to get wrong answers. Why? What can you do about it? Is it possible to write an SQL query to find employees who have never been in the same department for more than six months at a time? SQL supports "quantified comparisons," but they're better avoided. Why? How do you avoid them? Constraints are crucially important, but most SQL products don't support them properly. What can you do to resolve this situation? Database theory and practice have evolved since the relational model was developed more than 40 years ago. SQL and Relational Theory draws on decades of research to present the most up-to-date treatment of SQL available. C.J. Date has a stature that is unique within the database industry. A prolific writer well known for the bestselling textbook An Introduction to Database Systems (Addison-Wesley), he has an exceptionally clear style when writing about complex principles and theory.

Time And Relational Theory

Time and Relational Theory PDF
Author: C.J. Date
Publisher: Morgan Kaufmann
ISBN: 0128006757
Size: 75.73 MB
Format: PDF, ePub, Docs
Category : Computers
Languages : en
Pages : 560
View: 4709

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Time and Relational Theory provides an in-depth description of temporal database systems, which provide special facilities for storing, querying, and updating historical and future data. Traditionally, database management systems provide little or no special support for temporal data at all. This situation is changing because: Cheap storage enables retention of large volumes of historical data in data warehouses Users are now faced with temporal data problems, and need solutions Temporal features have recently been incorporated into the SQL standard, and vendors have begun to add temporal support to their DBMS products Based on the groundbreaking text Temporal Data & the Relational Model (Morgan Kaufmann, 2002) and new research led by the authors, Time and Relational Theory is the only book to offer a complete overview of the functionality of a temporal DBMS. Expert authors Nikos Lorentzos, Hugh Darwen, and Chris Date describe an approach to temporal database management that is firmly rooted in classical relational theory and will stand the test of time. This book covers the SQL:2011 temporal extensions in depth and identifies and discusses the temporal functionality still missing from SQL. Understand how the relational model provides an ideal basis for taming the complexities of temporal databases Learn how to analyze and evaluate commercial temporal products with this timely and important information Be able to use sound principles in designing and using temporal databases Understand the temporal support recently added to SQL with coverage of the new SQL features in this unique, accurate, and authoritative reference Appreciate the benefits of a truly relational approach to the problem with this clear, user friendly presentation

Relational Database Writings 1991 1994

Relational Database Writings  1991 1994 PDF
Author: C. J. Date
Publisher: Addison-Wesley
ISBN:
Size: 58.84 MB
Format: PDF, ePub
Category : Computers
Languages : en
Pages : 542
View: 2795

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Readers familiar with the three prior volumes of database guru Chris Date's Relational Database Writings series will need no further recommendation. The fourth volume compiles Date's authoritative columns, articles, and papers on various aspects of relational technology--spanning the years 1991 to 1994.

Third Update On Adult Learning Theory

Third Update on Adult Learning Theory PDF
Author: Sharan B. Merriam
Publisher: John Wiley & Sons
ISBN: 9781118045534
Size: 36.43 MB
Format: PDF
Category : Education
Languages : en
Pages : 96
View: 3373

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This Third Update on Adult Learning Theory followstwo earlier volumes on the same topic, the ahref="http://www.josseybass.com/WileyCDA/WileyTitle/productCd-1555426840.html"firstpublished in 1993/a and the ahref="http://www.josseybass.com/WileyCDA/WileyTitle/productCd-0787957739.html"secondin 2001/a. Only one topic, transformative learning theory, can befound in all three updates, representing the continuingdevelopments in research and alternative theoretical conceptions ofTL. Thanks to a growing body of research and theory-building, threetopics briefly touched on in 2001 are now separate chapters in thisthird update: spirituality and adult learning learning through the body narrative learning in adulthood Also new in this update is a chapter on non-Western perspectiveson learning and knowing. New developments in two other areas arealso explored: understanding the connection between the brain andlearning, and how modern and postmodern ways of knowing areconverging and are bring expressed in social movements. Theconcluding chapter identifies two trends in adult learning theoryfor the twenty-first century: attention to context, and to theholistic nature of learning in adulthood. This is 119th volume of the Jossey-Bass quarterly report seriesahref="http://www.josseybass.com/WileyCDA/WileyTitle/productCd-ACE.html"NewDirections for Adult and Continuing Education/a. Noted forits depth of coverage, New Directions for Adult andContinuing Education is an indispensable series thatexplores issues of common interest to instructors, administrators,counselors, and policymakers in a broad range of adult andcontinuing education settings, such as colleges and universities,extension programs, businesses, libraries, and museums.