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Answering Queries Using Views

  • Reference work entry
Encyclopedia of Database Systems

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Synonyms

Query rewriting using views

Definition

Answering queries using views refers to a data management problem and the set of related techniques, algorithms and other results to address it. The basic formulation of the problem is the following: Given a query Q over a database schema Σ, expressed in a query language L Q and a set of views V 1, V 2,...,V n over the same schema, expressed in a query language L V , is it possible to answer the query Q using (only) the views V 1, V 2,...,V n ?

The problem has a number of related formulations: What is the maximal set of tuples in the answer of Q that can be obtained from the views? If it is possible to access both the views and the database relations, what is the cheapest query execution plan for answering Q?

From the above, it is clear that this is more generally a family of problems. Problems of different complexity, often admitting different (or no) solutions and solution techniques, result from making choices about various...

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Recommended Reading

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Author information

Authors and Affiliations

    Authors
    1. Vasilis Vassalos
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    Editors and Affiliations

    1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

      LING LIU (Professor) (Professor)

    2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

      M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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    © 2009 Springer Science+Business Media, LLC

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    Vassalos, V. (2009). Answering Queries Using Views. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_849

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