Fifty Years of Relational, and Other Database Writings, Chris Date

Автор: Date Chris J.
Название: Stating the Obvious, and Other Database Writings
ISBN: 1634629035 ISBN-13(EAN): 9781634629034
Издательство: Gazelle Book Services
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Цена: 8149.00 р.
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Описание:

Some things seem so obvious that they don't need to be spelled out in detail. Or do they? In computing, at least (and probably in any discipline where accuracy and precision are important), it can be quite dangerous just to assume that some given concept is "obvious," and indeed universally understood. Serious mistakes can happen that way The first part of this book discusses features of the database field-equality, assignment, naming-where just such an assumption seems to have been made, and it describes some of the unfortunate mistakes that have occurred as a consequence. It also explains how and why the features in question aren't quite as obvious as they might seem, and it offers some advice on how to work around the problems caused by assumptions to the contrary.

Other parts of the book also deal with database issues where devoting some preliminary effort to spelling out exactly what the issues in question entailed could have led to much better interfaces and much more carefully designed languages. The issues discussed include redundancy and indeterminacy; persistence, encapsulation, and decapsulation; the ACID properties of transactions; and types vs. units of measure.

Finally, the book also contains a detailed deconstruction of, and response to, various recent pronouncements from the database literature, all of them having to do with relational technology. Once again, the opinions expressed in those pronouncements might seem "obvious" to some people (to the writers at least, presumably), but the fact remains that they're misleading at best, and in most cases just flat out wrong.

Автор: Date Chris
Название: Logic and Relational Theory
ISBN: 1634628756 ISBN-13(EAN): 9781634628754
Издательство: Gazelle Book Services
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Цена: 8792.00 р.
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Описание: This book is a revised, upgraded, and hugely improved version of an earlier one called Logic and Databases. Although its effectively a brand new book, therefore, the following remarks from that earlier book are still relevant here. First, logic and databases are inextricably intertwined. The relational model itself is essentially just elementary logic, tailored to database needs. Now, if youre a database professional, this wont be news to you -- but you still might not realize just how much everything we do in the database world is (or should be!) affected by logic. Logic is fundamental, and everywhere. As a database professional, therefore, you owe it to yourself to understand the basics of formal logic, and you ought to be able to explain (and perhaps defend) the connections between formal logic and database technology. And thats what this book is about. What it does is show, through a series of partly independent, partly interrelated essays, just how various crucial aspects of database technology -- some of them very familiar, others maybe less so -- are solidly grounded in formal logic. Overall, the goal is to help you realize the importance of logic in everything you do, and also, I hope, to help you see that logic can be fun.