Classification of annotation semirings over query containment

Abstract

We study the problem of query containment of (unions of) conjunctive queries over annotated databases. Annotations are typically attached to tuples and represent metadata such as probability, multiplicity, comments, or provenance. It is usually assumed that annotations are drawn from a commutative semiring. Such databases pose new challenges in query… (More)
DOI: 10.1145/2213556.2213590
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@inproceedings{Kostylev2012ClassificationOA, title={Classification of annotation semirings over query containment}, author={Egor V. Kostylev and Juan L. Reutter and Andr{\'a}s Z. Salamon}, booktitle={PODS}, year={2012} }