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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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.
Böhlen M.H., Jensen C.S., and Snodgrass R.T. Temporal statement modifiers. ACM Trans. Database Syst., 25(4):48, 2000.
Snodgrass R.T. Developing Time-Oriented Database Applications in SQL. Morgan Kaufmann, 1999.
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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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DOI: https://doi.org/10.1007/978-0-387-39940-9_1053
Publisher Name: Springer, Boston, MA
Print ISBN: 978-0-387-35544-3
Online ISBN: 978-0-387-39940-9
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