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IJCAI
2003

Query rewriting and answering under constraints in data integration systems

11 years 1 months ago
Query rewriting and answering under constraints in data integration systems
In this paper we address the problem of query answering and rewriting in global-as-view data integration systems, when key and inclusion dependencies are expressed on the global integration schema. In the case of sound views, we provide sound and complete rewriting techniques for a maximal class of constraints for which decidability holds. Then, we introduce a semantics which is able to cope with violations of constraints, and present a sound and complete rewriting technique for the same dec idable class of constraints. Finally, we consider the decision problem of query answering and give decidability and complexity results.
Andrea Calì, Domenico Lembo, Riccardo Rosat
Added 31 Oct 2010
Updated 31 Oct 2010
Type Conference
Year 2003
Where IJCAI
Authors Andrea Calì, Domenico Lembo, Riccardo Rosati
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