620 search results - page 12 / 124 » Algorithms for Rewriting Aggregate Queries Using Views |
109
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ER
2005
Springer
15 years 5 months ago
2005
Springer
Query rewriting is a fundamental task in query optimization and data integration. With the advent of the web, there has been renewed interest in data integration, where data is dis...
DKE
2006
14 years 11 months ago
2006
The last few years, there has been an extensive body of literature in data warehousing applications that primarily focuses on basket-type (transactional) data, common in retail in...
104
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VLDB
1995
ACM
15 years 3 months ago
1995
ACM
We address the problem of finding parallel plans for SQL queries using the two-phase approach of join ordering and query rewrite (JOQR) followed by parallelization. We focus on t...
APWEB
2004
Springer
15 years 5 months ago
2004
Springer
Queries to data warehouses often involve hundreds of complex aggregations over large volumes of data, and so it is infeasible to compute these queries by scanning the data sources ...
CIKM
2005
Springer
15 years 5 months ago
2005
Springer
We introduce the notion of views as a mechanism for securing and providing access control in the context of XML. Research in XML has explored several efficient querying mechanism...