Umfang:
1 Online-Resource (xix, 253 Seiten)
,
Illustrationen
Ausgabe:
Second edition
ISBN:
9781681734637
Serie:
Synthesis lectures on data management #54
Inhalt:
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 two new 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
Anmerkung:
Part of: Synthesis digital library of engineering and computer science
,
Title from PDF title page (viewed on May 3, 2019)
Weitere Ausg.:
Erscheint auch als Druck-Ausgabe, hardcover ISBN 978-1-68173-464-4
Weitere Ausg.:
Erscheint auch als Druck-Ausgabe, paperback ISBN 978-1-68173-462-0
Sprache:
Englisch
Schlagwort(e):
Abfrage
;
Datenbanksystem
;
Frage-Antwort-System
;
Information Extraction
;
Information Retrieval
DOI:
10.2200/S00884ED2V01Y201811DTM054
URL:
Volltext
(URL des Erstveröffentlichers)
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