View Updating and Relational Theory

Date, Chris J.

ISBN 10: 1449357849 / ISBN 13: 9781449357849

Editore: O\'Reilly Media, 2013

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Views are a key part of database technology, but they re often considered read-only. In this book, Chris Date - a leading expert in relational databases - offers practical techniques that allow you to update the views that a database presents to you.Vie. Codice articolo 4186491

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Titolo: View Updating and Relational Theory

Casa editrice: O\'Reilly Media

Data di pubblicazione: 2013

Legatura: Brossura

Condizione: New

Descrizione articolo

Riassunto:

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.

Informazioni sull?autore:

C.J. Date has a stature that is unique within the database industry. C.J. is a prolific writer, and is well-known for his best-selling textbook: An Introduction to Database Systems (Addison Wesley). C.J. is an exceptionally clear-thinking writer who can lay out principles and theory in a way easily understood by his audience.