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portada Answering Queries Using Views, Second Edition
Type
Physical Book
Author
Publisher
Language
English
Pages
253
Format
Paperback
Dimensions
23.5 x 19.1 x 1.5 cm
Weight
0.48 kg.
ISBN13
9783031007439
Edition No.
0002
Categories

Answering Queries Using Views, Second Edition

Foto Afrati (Author) · Rada Chirkova (Author) · Springer · Paperback

Answering Queries Using Views, Second Edition - Afrati, Foto ; Chirkova, Rada

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Synopsis "Answering Queries Using Views, Second Edition"

The topic of using views to answer queries has been popular for a few decades now, as it cuts across domains such as query optimization, information integration, data warehousing, website design and, recently, database-as-a-service and data placement in cloud systems. This book assembles foundational work on answering queries using views in a self-contained manner, with an effort to choose material that constitutes the backbone of the research. It presents efficient algorithms and covers the following problems: query containment; rewriting queries using views in various logical languages; equivalent rewritings and maximally contained rewritings; and computing certain answers in the data-integration and data-exchange settings. Query languages 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. This second edition includes twonew chapters that refer to tree-like data and respective query languages. Chapter 8 presents the data model for XML documents and the XPath query language, and Chapter 9 provides a theoretical presentation of tree-like data model and query language where the tuples of a relation share a tree-structured schema for that relation and the query language is a dialect of SQL with evaluation techniques appropriately modified to fit the richer schema.

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