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Issue No.06 - June (2009 vol.21)

pp: 939-942

Marc Gyssens , Hasselt University and the Transnational University of Limburg, Diepenbeek

George H.L. Fletcher , Washington State University, Vancouver

Dirk Van Gucht , Indiana University, Bloomington

DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TKDE.2008.221

ABSTRACT

We give a language-independent characterization of the expressive power of the relational algebra on finite sets of source-target relation instance pairs. The associated decision problem is shown to be cograph-isomorphism hard and in coNP. The main result is also applied in providing a new characterization of the generic relational queries.

INDEX TERMS

Query languages, relational algebra, data mapping, data integration, definability, expressibility, BP completeness, graph isomorphism, genericity, monotonicity.

CITATION

Marc Gyssens, George H.L. Fletcher, Dirk Van Gucht, "On the Expressive Power of the Relational Algebra on Finite Sets of Relation Pairs",

*IEEE Transactions on Knowledge & Data Engineering*, vol.21, no. 6, pp. 939-942, June 2009, doi:10.1109/TKDE.2008.221REFERENCES