肥料
发表于 2025-3-25 04:15:09
Wiener Studienjahre: 1906-1910,We may obtain a view instance . in either of the following two ways..In Chapter 3, we only considered the CWA, as it was proper for equivalent rewritings. For contained rewritings, however, we may have the following two different definitions.
吞下
发表于 2025-3-25 09:38:27
Wiener Studienjahre: 1906-1910,In this chapter we revisit the problems of query containment and of finding equivalent and maximally contained rewritings for the case where we are interested in applying the results only on those database instances that satisfy certain dependencies.
maverick
发表于 2025-3-25 13:24:18
Determiniertheit unendlicher Spiele,The problem of answering queries using views suggests several theoretical questions. In this chapter we discuss some of these questions.
Lament
发表于 2025-3-25 18:40:48
,Die H-Ähnlichkeit der Alkalispektren,What we covered in this book can be arranged along the following four axes that cut across chapters.
Coronary-Spasm
发表于 2025-3-25 20:31:10
Query Containment and Equivalence,The problem of rewriting queries using views is closely related to the problem of checking for query containment or equivalence. For most classes of problems, containment tests enable simple algorithms to rewrite queries using views. Rewriting queries is one of the techniques that is most often used to answer queries using views.
Femish
发表于 2025-3-26 03:24:04
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Senescent
发表于 2025-3-26 04:35:23
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Complement
发表于 2025-3-26 10:19:04
Answering Queries Using Views,The problem of answering queries using views suggests several theoretical questions. In this chapter we discuss some of these questions.
衣服
发表于 2025-3-26 14:01:15
Conclusion,What we covered in this book can be arranged along the following four axes that cut across chapters.
ferment
发表于 2025-3-26 17:00:08
Deskriptive und explorative Statistik,to which they give rise (Section 1.2). An informal discussion follows about specific technical problems in answering queries using views with concrete examples (Section 1.3). Then, for completeness and consistency of notation, we give formal definitions for the relational data model and query langua