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
Publication language: English
Institution: School of Business Informatics and Mathematics > Sonstige - Fakultät für Mathematik und Informatik
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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May, Norman ; Helmer, Sven ; Moerkotte, Guido (2003) Nested Queries and Quantifiers in an Ordered Context. Open Access [Working paper]
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