2145 search results - page 54 / 429 » Answering Queries Using Views |
113
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ESWS
2008
Springer
15 years 4 months ago
2008
Springer
In order to overcome the limitations of deductive logic-based approaches to deriving operational knowledge from ontologies, especially when data come from distributed sources, indu...
142
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PODS
2004
ACM
16 years 2 months ago
2004
ACM
Data exchange is the problem of taking data structured under a source schema and creating an instance of a target schema. Given a source instance, there may be many solutions ? ta...
140
Voted
DIS
2006
Springer
15 years 6 months ago
2006
Springer
The purpose of this paper is two-fold: First, we give efficient algorithms for answering itemset support queries for collections of itemsets from various representations of the fre...
191
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SIGMOD
2007
ACM
16 years 2 months ago
2007
ACM
Accurate cardinality estimation is critically important to high-quality query optimization. It is well known that conventional cardinality estimation based on histograms or simila...
233
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ICDE
2007
IEEE
16 years 3 months ago
2007
IEEE
Linear optimization queries retrieve the top-K tuples in a sliding window of a data stream that maximize/minimize the linearly weighted sums of certain attribute values. To effici...