Nested Queries and Quantifiers in an Ordered Context

May, Norman ; Helmer, Sven ; Moerkotte, Guido

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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.

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