两边在扩散
发表于 2025-3-21 17:10:22
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Urea508
发表于 2025-3-21 22:27:06
Finding Equivalent Rewritings, 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
diskitis
发表于 2025-3-22 01:24:36
Answering Queries in Data Exchange, for a set of views V 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 approach w
Fallibility
发表于 2025-3-22 08:21:15
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玷污
发表于 2025-3-22 11:28:00
Finding Equivalent Rewritings,eration to the fragment of the language of conjunctive queries with aggregation that is called "central rewritings." Our focus will be on finding (minimal) equivalent rewritings in an efficient way. Other languages for rewritings will be discussed in other parts of the book.
Diuretic
发表于 2025-3-22 14:08:47
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射手座
发表于 2025-3-22 19:18:27
Deskriptive und explorative Statistik, examples (Section 1.3). Then, for completeness and consistency of notation, we give formal definitions for the relational data model and query languages (Section 1.4). We conclude the chapter with an outline of the structure of the book.
progestin
发表于 2025-3-22 21:43:14
Queries and Views, examples (Section 1.3). Then, for completeness and consistency of notation, we give formal definitions for the relational data model and query languages (Section 1.4). We conclude the chapter with an outline of the structure of the book.
spondylosis
发表于 2025-3-23 01:28:38
Book 2018ages that are considered are fragments of SQL, in particular, select-project-join queries, also called conjunctive queries (with or without arithmetic comparisons or negation), and aggregate SQL queries..
mediocrity
发表于 2025-3-23 08:19:49
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