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Time and Relational Theory, 2nd Edition
book

Time and Relational Theory, 2nd Edition

by C.J. Date, Hugh Darwen, Nikos Lorentzos
August 2014
Advanced content levelAdvanced
560 pages
15h 32m
English
Morgan Kaufmann
Content preview from Time and Relational Theory, 2nd Edition
Chapter 10

The PACK and UNPACK Operators II: The Multiattribute Case

Although the concept of packing and unpacking relations is essentially straightforward (at least when the operation is performed on the basis of just a single interval attribute), it turns out that the concept has a variety of implications and ramifications—not all of which are immediately obvious—when the operation is performed on the basis of N such attributes when N is not equal to 1. This chapter investigates such matters in depth. In particular, it shows how those investigations lead to an important concept of equivalence among relations and to a novel concept of redundancy in relations with interval attributes.

Keywords

UNPACK; PACK; unpacked form; packed form; equivalence ...

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Publisher Resources

ISBN: 9780128006313