View Updating And Relational Theory

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View Updating and Relational Theory

Author : C.J. Date
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 1449357806
Total Pages : 263 pages
Book Rating : 4.4/5 (493 download)

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Book Synopsis View Updating and Relational Theory by : C.J. Date

Download or read book View Updating and Relational Theory written by C.J. Date and published by "O'Reilly Media, Inc.". This book was released on 2012-12-20 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

View Updating and Relational Theory

Author : Chris Date
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 1449357849
Total Pages : 263 pages
Book Rating : 4.4/5 (493 download)

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Book Synopsis View Updating and Relational Theory by : Chris Date

Download or read book View Updating and Relational Theory written by Chris Date and published by "O'Reilly Media, Inc.". This book was released on 2013 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

SQL and Relational Theory

Author : C. Date
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 1449316409
Total Pages : 447 pages
Book Rating : 4.4/5 (493 download)

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Book Synopsis SQL and Relational Theory by : C. Date

Download or read book SQL and Relational Theory written by C. Date and published by "O'Reilly Media, Inc.". This book was released on 2011-12-16 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

SQL and Relational Theory

Author : C.J. Date
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 1491941138
Total Pages : 692 pages
Book Rating : 4.4/5 (919 download)

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Book Synopsis SQL and Relational Theory by : C.J. Date

Download or read book SQL and Relational Theory written by C.J. Date and published by "O'Reilly Media, Inc.". This book was released on 2015-11-06 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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, Revised Edition

Author : C. J. Date
Publisher : Technics Publications
ISBN 13 : 1634629302
Total Pages : 307 pages
Book Rating : 4.6/5 (346 download)

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Book Synopsis E. F. Codd and Relational Theory, Revised Edition by : C. J. Date

Download or read book E. F. Codd and Relational Theory, Revised Edition written by C. J. Date and published by Technics Publications. This book was released on with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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—a thorough overhaul and rewrite of an earlier book by the same name—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 database 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. Database theory and practice have evolved considerably since Codd first defined his relational model, back in 1969. This book draws on decades of experience to present the most up to date treatment of the material possible. Anyone with a professional interest in databases can benefit from the insights it contains. The book is product independent.

E. F. Codd and Relational Theory: A Detailed Review and Analysis of CoddÕs Major Database Writings

Author : C. J. Date
Publisher : Lulu.com
ISBN 13 : 1684705274
Total Pages : 306 pages
Book Rating : 4.6/5 (847 download)

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Book Synopsis E. F. Codd and Relational Theory: A Detailed Review and Analysis of CoddÕs Major Database Writings by : C. J. Date

Download or read book E. F. Codd and Relational Theory: A Detailed Review and Analysis of CoddÕs Major Database Writings written by C. J. Date and published by Lulu.com. This book was released on 2019-07-18 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Query Processing in Database Systems

Author : W. Kim
Publisher : Springer Science & Business Media
ISBN 13 : 3642823750
Total Pages : 367 pages
Book Rating : 4.6/5 (428 download)

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Book Synopsis Query Processing in Database Systems by : W. Kim

Download or read book Query Processing in Database Systems written by W. Kim and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an anthology of the results of research and development in database query processing during the past decade. The relational model of data provided tremendous impetus for research into query processing. Since a relational query does not specify access paths to the stored data, the database management system (DBMS) must provide an intelligent query-processing subsystem which will evaluate a number of potentially efficient strategies for processing the query and select the one that optimizes a given performance measure. The degree of sophistication of this subsystem, often called the optimizer, critically affects the performance of the DBMS. Research into query processing thus started has taken off in several directions during the past decade. The emergence of research into distributed databases has enormously complicated the tasks of the optimizer. In a distributed environment, the database may be partitioned into horizontal or vertical fragments of relations. Replicas of the fragments may be stored in different sites of a network and even migrate to other sites. The measure of performance of a query in a distributed system must include the communication cost between sites. To minimize communication costs for-queries involving multiple relations across multiple sites, optimizers may also have to consider semi-join techniques.

Database Design and Relational Theory

Author : C. J. Date
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 1449328016
Total Pages : 277 pages
Book Rating : 4.4/5 (493 download)

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Book Synopsis Database Design and Relational Theory by : C. J. Date

Download or read book Database Design and Relational Theory written by C. J. Date and published by "O'Reilly Media, Inc.". This book was released on 2012-04-17 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because databases often stay in production for decades, careful design is critical to making the database serve the needs of your users over years, and to avoid subtle errors or performance problems. In this book, C.J. Date, a leading exponent of relational databases, lays out the principles of good database design.

Relational Theory for Computer Professionals

Author : C.J. Date
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 1449369456
Total Pages : 146 pages
Book Rating : 4.4/5 (493 download)

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Book Synopsis Relational Theory for Computer Professionals by : C.J. Date

Download or read book Relational Theory for Computer Professionals written by C.J. Date and published by "O'Reilly Media, Inc.". This book was released on 2013-05-21 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Database in Depth

Author : C.J. Date
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 1449342647
Total Pages : 234 pages
Book Rating : 4.4/5 (493 download)

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Book Synopsis Database in Depth by : C.J. Date

Download or read book Database in Depth written by C.J. Date and published by "O'Reilly Media, Inc.". This book was released on 2005-05-05 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

View Updating and Relational Theory

Author : C. J. Date
Publisher :
ISBN 13 : 9781449357795
Total Pages : 240 pages
Book Rating : 4.3/5 (577 download)

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Book Synopsis View Updating and Relational Theory by : C. J. Date

Download or read book View Updating and Relational Theory written by C. J. Date and published by . This book was released on 2013 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Relational Theory for Social Work Practice

Author : Sharon Freedberg
Publisher :
ISBN 13 : 9780789012647
Total Pages : 0 pages
Book Rating : 4.0/5 (126 download)

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Book Synopsis Relational Theory for Social Work Practice by : Sharon Freedberg

Download or read book Relational Theory for Social Work Practice written by Sharon Freedberg and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text introduces social workers to the burgeoning feminist scholarship on relational theories and their practical application with diverse populations. It emphasizes the application of the basic relational concepts in a readable and comprehensive way, developing an approach to practice which is useful for both social workers and clients.

A Relational Theory of World Politics

Author : Yaqing Qin
Publisher :
ISBN 13 : 1107183146
Total Pages : 415 pages
Book Rating : 4.1/5 (71 download)

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Book Synopsis A Relational Theory of World Politics by : Yaqing Qin

Download or read book A Relational Theory of World Politics written by Yaqing Qin and published by . This book was released on 2018-04-05 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: A reinterpretation of world politics drawing on Chinese cultural and philosophical traditions to argue for a focus on relations amongst actors, rather than on the actors individually.

Time and Relational Theory

Author : C.J. Date
Publisher : Morgan Kaufmann
ISBN 13 : 0128006757
Total Pages : 579 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Time and Relational Theory by : C.J. Date

Download or read book Time and Relational Theory written by C.J. Date and published by Morgan Kaufmann. This book was released on 2014-08-13 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

The New Relational Database Dictionary

Author : C.J. Date
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 1491951699
Total Pages : 540 pages
Book Rating : 4.4/5 (919 download)

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Book Synopsis The New Relational Database Dictionary by : C.J. Date

Download or read book The New Relational Database Dictionary written by C.J. Date and published by "O'Reilly Media, Inc.". This book was released on 2015-12-21 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: No matter what DBMS you are using—Oracle, DB2, SQL Server, MySQL, PostgreSQL—misunderstandings can always arise over the precise meanings of terms, misunderstandings that can have a serious effect on the success of your database projects. For example, here are some common database terms: attribute, BCNF, consistency, denormalization, predicate, repeating group, join dependency. Do you know what they all mean? Are you sure? The New Relational Database Dictionary defines all of these terms and many, many more. Carefully reviewed for clarity, accuracy, and completeness, this book is an authoritative and comprehensive resource for database professionals, with over 1700 entries (many with examples) dealing with issues and concepts arising from the relational model of data. DBAs, database designers, DBMS implementers, application developers, and database professors and students can find the information they need on a daily basis, information that isn’t readily available anywhere else.

Relational Theory and the Practice of Psychotherapy

Author : Paul L. Wachtel
Publisher : Guilford Press
ISBN 13 : 1606238329
Total Pages : 353 pages
Book Rating : 4.6/5 (62 download)

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Book Synopsis Relational Theory and the Practice of Psychotherapy by : Paul L. Wachtel

Download or read book Relational Theory and the Practice of Psychotherapy written by Paul L. Wachtel and published by Guilford Press. This book was released on 2007-12-14 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important and innovative book explores a new direction in psychoanalytic thought that can expand and deepen clinical practice. Relational psychoanalysis diverges in key ways from the assumptions and practices that have traditionally characterized psychoanalysis. At the same time, it preserves, and even extends, the profound understanding of human experience and psychological conflict that has always been the strength of the psychoanalytic approach. Through probing theoretical analysis and illuminating examples, the book offers new and powerful ways to revitalize clinical practice. See also Wachtel's Therapeutic Communication, Second Edition: Knowing What to Say When, an integrative, practical guide for therapists of all orientations.

Entity-Relationship Approach - ER '92

Author : Günther Pernul
Publisher : Springer Science & Business Media
ISBN 13 : 9783540560234
Total Pages : 460 pages
Book Rating : 4.5/5 (62 download)

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Book Synopsis Entity-Relationship Approach - ER '92 by : Günther Pernul

Download or read book Entity-Relationship Approach - ER '92 written by Günther Pernul and published by Springer Science & Business Media. This book was released on 1992-10-05 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.