Date Chris J. - View Updating & Relational Theory. Solving The View Update Problem, Data Management
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View Updating and Relational Theory Solving the View Update Problem C. J. Date View Updating and Relational Theory by C. J. Date Copyright © 2013 C. J. Date. All rights reserved. Printed in the United States of America. Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472 O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles ( http://my.safaribooksonline.com ). For more information, contact our corporate/institutional sales department: (800) 998-9938 or corporate@oreilly.com . Printing History: January 2013: First Edition. Revision History: 2012-12-12 First release See http://oreilly.com/catalog/errata.csp?isbn=0636920028437 for release details. Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly Media, Inc. View Updating and Relational Theory and related trade dress are trademarks of O’Reilly Media, Inc. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and O’Reilly Media, Inc., was aware of a trademark claim, the designations have been printed in caps or initial caps. While every precaution has been taken in the preparation of this book, the publisher and author assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. ISBN: 978-1-449-35784-9 [LSI] Intension extension Edgar F. Codd Invented a notion We now know as views Now view and base relvar Exchangeability Got us all singing Those view update blues —Anon.: Where Bugs Go The duke of Ormond took a view yesterday of his troop, and ordered all that had bay or grey horses to change them for black. —earliest known example (1693) of view updating, quoted in the Oxford English Dictionary from “A Brief Historical Relation of State Affairs 1678–1714,” by Narcissus Luttrell (1857) A little learning is a dangerous thing; Drink deep, or taste not the Pierian spring: There shallow drafts intoxicate the brain, And drinking largely sobers us again. —Alexander Pope: An Essay on Criticism (1711 ) ─── ♦♦♦♦♦ ─── To my wife Lindy and my daughters Sarah and Jennie with all my love [ Pobierz całość w formacie PDF ] |