TITLE: On the Expressiveness of Implicit
Provenance in Query and Update Languages 
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PRESENTER: Roman Yarovoy<br>
TIME: Thu Nov 13, 2pm<br>
LOCATION: room 304<br>
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ABSTRACT:
Information concerning the origin of data (that is, its provenance) is important in many areas, especially scientific recordkeeping. Currently, provenance information must be maintained explicitly, by added effort of the database maintainer. Since such maintenance is tedious and error-prone, it is desirable to provide support for provenance in the database system itself. In order to provide such support, however, it is important to provide a clear explanation of the behavior and meaning of existing database operations, both queries and updates, with respect to provenance. In this paper we take the view that a query or update implicitly defines a provenance mapping linking components of the output to the originating components in the input. Our key result is that the proposed semantics are expressively complete relative to natural classes of queries that explicitly manipulate provenance
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SUGGESTED READING:<br>
P. Buneman, J. Cheney, and S. VanSummeren. On the Expressiveness of Implicit
Provenance in Query and Update Languages. In International Conference on
Database Theory (ICDT), pages 209--223, 2007.