620 search results - page 30 / 124 » Algorithms for Rewriting Aggregate Queries Using Views |
154
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SIGMOD
2001
ACM
16 years 3 months ago
2001
ACM
Materialized views have been found to be very effective at speeding up queries, and are increasingly being supported by commercial databases and data warehouse systems. However, w...
144
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VLDB
2004
ACM
15 years 9 months ago
2004
ACM
XML languages, such as XQuery, XSLT and SQL/XML, employ XPath as the search and extraction language. XPath expressions often define complicated navigation, resulting in expensive...
191
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ICDE
2011
IEEE
14 years 7 months ago
2011
IEEE
— In this paper, we study the problem of efficiently computing multiple aggregation queries over a data stream. In order to share computation, prior proposals have suggested ins...
115
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WSDM
2009
ACM
15 years 10 months ago
2009
ACM
There has been considerable past work on efficiently computing top k objects by aggregating information from multiple ranked lists of these objects. An important instance of this...
241
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ICDE
1996
IEEE
16 years 5 months ago
1996
IEEE
Query folding refers to the activity of determining if and how a query can be answered using a given set of resources, which might be materialized views, cached results of previou...