Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Sequenced Semantics

  • Michael H. Böhlen
  • Christian S. Jensen
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_1053

Definition

Sequenced semantics make it possible to generalize a query language statement on a nontemporal database to a temporal query on a corresponding temporal, interval time-stamped database by applying minor syntactic modifications to the statement that are independent of the particular statement. The semantics of such a generalized statement is consistent with considering the temporal database as being composed of a sequence of nontemporal database states. Sequenced semantics takes into account the interval timestamps of the argument tuples when forming the interval timestamps associated with result tuples, as well as permits the use of additional timestamp-related predicates in statements.

Key Points

A question that has intrigued temporal database researchers for years is how to systematically generalize nontemporal query language statements, i.e., queries on nontemporal databases, to apply to corresponding temporal databases. A prominent approach is to view a temporal database...

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Recommended Reading

  1. 1.
    Böhlen MH, Busatto R, Jensen CS. Point- versus interval-based temporal data models. In: Proceedings of the 14th International Conference on Data Engineering; 1998. p. 192–200.Google Scholar
  2. 2.
    Böhlen MH, Jensen CS, Snodgrass RT. Temporal statement modifiers. ACM Trans Database Syst. 2000;25(4):48.zbMATHCrossRefGoogle Scholar
  3. 3.
    Snodgrass RT. Developing time-oriented database applications in SQL. San Francisco: Morgan Kaufmann; 1999.Google Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Free University of Bozen-BolzanoBozen-BolzanoItaly
  2. 2.University of ZurichZürichSwitzerland
  3. 3.Department of Computer ScienceAalborg UniversityAalborgDenmark

Section editors and affiliations

  • Richard T. Snodgrass
    • 1
  • Christian S. Jensen
    • 2
  1. 1.University of ArizonaTucsonUSA
  2. 2.Aalborg UniversityAalborg ØstDenmark