Answering Queries Using Views, Second Edition

di Foto Afrati (Autore)

Rada Chirkova (Autore)

Springer International Publishing AG, 2019

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.

• Autore: Foto Afrati, Rada Chirkova
• Editore: Springer International Publishing AG
• Collana: Synthesis Lectures on Data Management
• Anno: 2019
• Rilegatura: Paperback / softback
• Pagine: 253 p.
• Dimensioni: 235 x 191 mm
• EAN: 9783031007439

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