2514 search results - page 128 / 503 » On the Computation of Approximations of Database Queries |
307
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GIS
2005
ACM
16 years 7 months ago
2005
ACM
An interesting issue in moving objects databases is to find similar trajectories of moving objects. Previous work on this topic focuses on movement patterns (trajectories with tim...
195
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CCS
2008
ACM
15 years 8 months ago
2008
ACM
We propose an approach for the selective enforcement of access control restrictions in, possibly distributed, large data collections based on two basic concepts: i) flexible autho...
292
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GIS
2006
ACM
16 years 7 months ago
2006
ACM
Moving point object data can be analyzed through the discovery of patterns. We consider the computational efficiency of computing two of the most basic spatio-temporal patterns in...
199
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SIGMOD
2011
ACM
14 years 9 months ago
2011
ACM
In this paper we consider the problem of answering queries using views, which is important for data integration, query optimization, and data warehouses. We consider its simplest ...
269
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PODS
2009
ACM
16 years 7 months ago
2009
ACM
d Abstract) Andrea Cal`i2,1 , Georg Gottlob1,2 , and Thomas Lukasiewicz1, 1 Computing Laboratory, University of Oxford, UK firstname.lastname@comlab.ox.ac.uk 2 Oxford-Man Institute...