654 search results - page 63 / 131 » Complexity of Answering Queries Using Materialized Views |
137
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SIGMOD
1997
ACM
15 years 7 months ago
1997
ACM
A range query applies an aggregation operation over all selected cells of an OLAP data cube where the selection is speci ed by providing ranges of values for numeric dimensions. W...
96
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SBBD
2007
15 years 4 months ago
2007
Active XML (AXML) documents combine extensional XML data with intentional data defined through Web service calls. The dynamic properties of these documents pose challenges to both ...
112
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ESWS
2010
Springer
15 years 5 months ago
2010
Springer
Abstract. Description Logic Programs (DL-programs) have been introduced to combine ontological and rule-based reasoning in the context of the Semantic Web. A DL-program loosely com...
160
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EDBT
2012
ACM
13 years 5 months ago
2012
ACM
In this paper we consider the problem of answering queries using views, with or without ontological constraints, which is important for data integration, query optimization, and d...
159
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JACM
2008
15 years 3 months ago
2008
XML queries are usually expressed by means of XPath expressions identifying portions of the selected documents. An XPath expression defines a way of navigating an XML tree and ret...