Titlebook: Answering Queries Using Views; Foto Afrati,Rada Chirkova Book 2018 Springer Nature Switzerland AG 2018

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Urea508

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

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

玷污

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

射手座

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

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

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