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Databases Illuminated, 4th Edition
book

Databases Illuminated, 4th Edition

by Catherine M. Ricardo, Susan D. Urban, Karen C. Davis
March 2022
Intermediate to advanced content levelIntermediate to advanced
682 pages
22h 58m
English
Jones & Bartlett Learning
Content preview from Databases Illuminated, 4th Edition

7.4 Temporal Databases and SQL

A temporal database is one that includes some representation of time. The example databases we have discussed so far all contain records that represent current facts about the enterprise, so the time is assumed to be the present. In the University example, the tables only show data about the current session. In the Worker and Project example, we keep information about active projects, workers, and their current assignments. As changes are made in the real world, the records are updated to reflect the changes, overwriting the old values so that the database state always reflects just the current information. For the university, such a system would require a complete change periodically. As each new semester starts, ...

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Publisher Resources

ISBN: 9781284231595