Titlebook: Answering Queries Using Views, Second Edition; Foto Afrati,Rada Chirkova Book 2019Latest edition Springer Nature Switzerland AG 2019

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书目名称Answering Queries Using Views, Second Edition读者反馈学科排名

女歌星

https://doi.org/10.1007/978-3-322-94951-6 of CQ, CQAC, and CQN queries and views, as well as aggregate queries. We generally restrict the discussion to the cases where we are looking for a rewriting in the language of conjunctive queries, with or without ACs and negation. Furthermore, in the case of aggregate queries we restrict our consid

慢慢啃

Klaus Schwerma,Andrea von Marschall, for a set of views . defined on the schema of ., we are given an instance ., which is either the set of all tuples in .(.) or its subset. So, being unable to compute . directly on ., we have to find techniques for answering . on the instance . whose schema is that of the view relations. The approa

出没

Klaus Schwerma,Andrea von Marschalllar fragment of XPath, which is such a query language. This is the fragment that includes wildcard, descendant, and branching. In this chapter, we present efficient query containment tests and define and discuss equivalent rewritings.

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Abbreviate

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Answering Queries Using Views, Second Edition978-3-031-01871-8Series ISSN 2153-5418 Series E-ISSN 2153-5426

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inspiration

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