Nested Queries and Quantifiers in an Ordered Context

May, Norman ; Helmer, Sven ; Moerkotte, Guido

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URL:	http://ub-madoc.bib.uni-mannheim.de/731
URN:	urn:nbn:de:bsz:180-madoc-7317
Document Type:	Working paper
Year of publication:	2003
The title of a journal, publication series:	None
Publication language:	English
Institution:	School of Business Informatics and Mathematics > Sonstige - Fakultät für Wirtschaftsinformatik und Wirtschaftsmathematik
MADOC publication series:	Veröffentlichungen der Fakultät für Mathematik und Informatik > Institut für Informatik > Technical Reports
Subject:	004 Computer science, internet
Subject headings (SWD):	Abfrageverarbeitung , XQuery
Individual keywords (German):	Abfrageverarbeitung , XQuery
Keywords (English):	databases , XML , query optimization
Abstract:	We present algebraic equivalences that allow to unnest nested algebraic expressions for order-preserving algebraic operators. We illustrate how these equivalences can be applied successfully to unnest nested queries given in the XQuery language. Measurements illustrate the performance gains possible by our approach.
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Das Dokument wird vom Publikationsserver der Universitätsbibliothek Mannheim bereitgestellt.

BASE: May, Norman ; Helmer, Sven ; Moerkotte, Guido

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