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Encyclopedia of Database Systems pp 2506–2507Cite as

Nonsequenced Semantics

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Synonyms

Nontemporal semantics

Definition

Nonsequenced semantics guarantees that query language statements can reference and manipulate the timestamps that capture the valid and transaction time of data in temporal databases as regular attribute values, with no built-in temporal semantics being enforced by the query language.

Key Points

A temporal database generalizes a nontemporal database and associates one or more timestamps with database entities. Different authors have suggested temporal query languages that provide advanced support for formulating temporal statements. Results of these efforts include a variety of temporal extensions of SQL, temporal algebras, and temporal logics that simplify the management of temporal data.

Languages with built-in temporal support are attractive because they offer convenient support for formulating a wide range of common temporal statements. The classical example of advanced built-in temporal support is sequenced semantics, which makes it...

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Recommended Reading

  1. Abiteboul S, Herr L, Van den Bussche J. Temporal versus first-order logic to query temporal databases. In: Proceedings of the 15th ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems; 1996. p. 49–57.

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  2. Allen JF. Maintaining knowledge about temporal intervals. Commun ACM. 1983;16(11):832–43.

    Article  MATH  Google Scholar 

  3. Böhlen MH, Jensen CS, Snodgrass RT. Temporal statement modifiers. ACM Trans Database Syst. 2000;25(4):48.

    Article  MATH  Google Scholar 

  4. Toman D, Niwiński D. First-order queries over temporal databases inexpressible in temporal logic. In: Advances in Database Technology, Proceedings of the 5th International Conference on Extending Database Technology; 1996. p. 307–24.

    Chapter  Google Scholar 

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Author information

Authors and Affiliations

  1. Free University of Bozen-Bolzano, Bozen-Bolzano, Italy

    Michael H. Böhlen

  2. Department of Computer Science, Aalborg University, Aalborg, Denmark

    Christian S. Jensen

  3. Department of Computer Science, University of Arizona, Tucson, AZ, USA

    Richard T. Snodgrass

  4. Dataware Ventures, Tucson, AZ, USA

    Richard T. Snodgrass

  5. University of Zurich, Zürich, Switzerland

    Michael H. Böhlen

Authors
  1. Michael H. Böhlen
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  2. Christian S. Jensen
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  3. Richard T. Snodgrass
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Corresponding authors

Correspondence to Michael H. Böhlen , Christian S. Jensen or Richard T. Snodgrass .

Editor information

Editors and Affiliations

  1. Georgia Institute of Technology College of Computing, Atlanta, GA, USA

    Ling Liu

  2. University of Waterloo School of Computer Science, Waterloo, ON, Canada

    M. Tamer Özsu

Section Editor information

  1. University of Arizona, Tucson, AZ, USA

    Richard T. Snodgrass

  2. Aalborg University, Aalborg Øst, Denmark

    Christian S. Jensen

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Böhlen, M.H., Jensen, C.S., Snodgrass, R.T. (2018). Nonsequenced Semantics. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_1052

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