2514 search results - page 126 / 503 » On the Computation of Approximations of Database Queries |
292
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ICDT
2009
ACM
16 years 7 months ago
2009
ACM
The class of unions of conjunctive queries (UCQ) has been shown to be particularly well-behaved for data exchange; its certain answers can be computed in polynomial time (in terms...
166
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SSD
1999
Springer
15 years 10 months ago
1999
Springer
Traffic telematics comprises services like traffic information, navigation, and emergency call services. Providers of such services need large spatial databases especially for the ...
161
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SSD
2007
Springer
16 years 16 days ago
2007
Springer
In many modern applications such as biometric identification systems, sensor networks, medical imaging, geology, and multimedia databases, the data objects are not described exact...
277
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VLDB
2007
ACM
16 years 6 months ago
2007
ACM
In this article, we propose a new approach for querying and indexing a database of trees with specific applications to XML datasets. Our approach relies on representing both the q...
180
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FQAS
2009
Springer
16 years 1 months ago
2009
Springer
Abstract. Controlled languages (CLs) are ambiguity-free subsets of natural languages such as English offering a good trade-off between the formal rigor of ontology and query langua...