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Please use this identifier to cite or link to this item:
http://hdl.handle.net/2451/14214
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| Title: | ON PERIODICITY IN TEMPORAL DATABASES |
| Authors: | Tuzhilin, Alex
Clifford, James |
| Issue Date: | 1995 |
| Publisher: | Stern School of Business, New York University |
| Series/Report no.: | IS-95-06 |
| Abstract: | The issue of periodicity is generally understood to be a desirable
property of temporal data that should be supported by temporal database
models and their query languages. Nevertheless, there has so far not
been any systematic examination of how to incorporate this concept into
a temporal DBMS. In this paper we describe two concepts of periodicity,
which we call strong periodicity and near periodicity, and discuss how
they capture formally two of the intuitive meanings of this term. We
formally compare the expressive power of these two concepts, relate them
to existing temporal query languages, and show how they can be
incorporated into temporal relational database query languages, such as
the proposed temporal extension to SQL, in a clean and straightforward manner. |
| URI: | http://hdl.handle.net/2451/14214 |
| Appears in Collections: | IOMS: Information Systems Working Papers
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