Views and queries: Determinacy and rewriting

    ACM Trans. Database Syst., ArticleNo.21, 2010.

    Cited by: 61|Bibtex|Views11|Links
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    Keywords:
    set Vquery languageviewsvarious viewinformation-theoretic notionMore(8+)

    Abstract:

    We investigate the question of whether a query Q can be answered using a set V of views. We first define the problem in information-theoretic terms: we say that V determines Q if V provides enough information to uniquely determine the answer to Q. Next, we look at the problem of rewriting Q in terms of V using a specific language. Given a...More

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