620 search results - page 94 / 124 » Algorithms for Rewriting Aggregate Queries Using Views |
129
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IDEAS
2000
IEEE
15 years 8 months ago
2000
IEEE
Most operations of the relational algebra or SQL - like projection with duplicate elimination, join, ordering, group by and aggregations - are efficiently processed using a sorted...
233
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SIGMOD
2009
ACM
16 years 3 months ago
2009
ACM
A large number of online databases are hidden behind the web. Users to these systems can form queries through web forms to retrieve a small sample of the database. Sampling such h...
116
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SSDBM
2007
IEEE
15 years 10 months ago
2007
IEEE
In stream join processing with limited memory, uniform random sampling is useful for approximate query evaluation. In this paper, we address the problem of reservoir sampling over...
205
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SIGMOD
2007
ACM
16 years 3 months ago
2007
ACM
Sketching techniques can provide approximate answers to aggregate queries either for data-streaming or distributed computation. Small space summaries that have linearity propertie...
110
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DCOSS
2006
Springer
15 years 7 months ago
2006
Springer
In a sensor network information from multiple nodes must usually be aggregated in order to accomplish a certain task. A natural way to view this information gathering is in terms o...