492 search results - page 65 / 99 » Computing aggregations in database query languages |
202
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ISPAN
2009
IEEE
16 years 1 months ago
2009
IEEE
Abstract—Querying non-conventional data sources is recognized as a major issue in new environments and applications such as those occurring in pervasive computing. A key issue is...
167
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BTW
2007
Springer
16 years 22 days ago
2007
Springer
: Statistics that accurately describe the distribution of data values in the columns of relational tables are essential for effective query optimization in a database management sy...
186
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EDBT
2012
ACM
13 years 9 months ago
2012
ACM
We present an effective optimization framework for general SQLlike map-reduce queries, which is based on a novel query algebra and uses a small number of higher-order physical ope...
300
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ICDT
2011
ACM
14 years 10 months ago
2011
ACM
Distributed data management systems consist of peers that store, exchange and process data in order to collaboratively achieve a common goal, such as evaluate some query. We study...
206
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EDBTW
2010
Springer
15 years 10 months ago
2010
Springer
Successfully structuring information in databases, OLAP cubes, and XML is a crucial element in managing data nowadays. However this process brought new challenges to usability. It...