CHAFF
发表于 2025-3-21 18:49:26
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女歌星
发表于 2025-3-22 00:09:29
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
发表于 2025-3-22 02:40:32
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
发表于 2025-3-22 07:15:18
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.
乱砍
发表于 2025-3-22 11:44:36
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Abbreviate
发表于 2025-3-22 14:13:25
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打折
发表于 2025-3-22 18:39:12
Answering Queries Using Views, Second Edition978-3-031-01871-8Series ISSN 2153-5418 Series E-ISSN 2153-5426
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发表于 2025-3-22 22:26:10
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发表于 2025-3-23 08:23:57
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