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Sequenced Semantics

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Encyclopedia of Database Systems

Definition

Sequenced semantics make it possible to generalize a query language statement on a non-temporal database to a temporal query on a corresponding temporal, interval-timestamped 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 non-temporal 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 non-temporal query language statements, i.e., queries on non-temporal databases, to apply to corresponding temporal databases. A prominent approach is to view a temporal...

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Recommended Reading

  1. Böhlen M.H., Busatto R., and Jensen C.S. Point- versus interval-based temporal data models. In Proc. 14th Int. Conf. on Data Engineering, 1998, pp. 192–200.

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  2. Böhlen M.H., Jensen C.S., and Snodgrass R.T. Temporal statement modifiers. ACM Trans. Database Syst., 25(4):48, 2000.

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  3. Snodgrass R.T. Developing Time-Oriented Database Applications in SQL. Morgan Kaufmann, 1999.

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Author information

Authors and Affiliations

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

    Michael H. Böhlen

  2. Aalborg University, Aalborg, Denmark

    Christian S. Jensen

Authors
  1. Michael H. Böhlen
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  2. Christian S. Jensen
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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Böhlen, M.H., Jensen, C.S. (2009). Sequenced Semantics. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_1053

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