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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 5

What’s the Problem?

In a nutshell, the problem of temporal data is that it quickly leads to constraints and queries (and updates) that are unreasonably complex to express—unreasonably complex, that is, unless the system provides some well designed shorthands, which commercially available DBMSs typically don’t. This chapter illustrates this fact by, first, considering a simple nontemporal database and certain simple constraints and queries on that database; second, “semitemporalizing” that database by introducing appropriate “since” attributes and investigating what happens to those constraints and queries on that semitemporal version of the database; and, third and last, “fully temporalizing” the database by introducing appropriate “from” ...

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Publisher Resources

ISBN: 9780128006313