429 search results - page 12 / 86 » A SAT approach to query optimization in mediator systems |
STOC
2012
ACM
11 years 11 months ago
2012
ACM
We consider submodular optimization problems, and provide a general way of translating oracle inapproximability results arising from the symmetry gap technique to computational co...
SIGMOD
2001
ACM
14 years 8 months ago
2001
ACM
The ability to approximately answer aggregation queries accurately and efficiently is of great benefit for decision support and data mining tools. In contrast to previous sampling...
HICSS
2003
IEEE
14 years 1 months ago
2003
IEEE
We apply multiple query optimization to batches of pull (on-demand) requests in a mobile database system. The resulting view can answer several queries at once, and it is broadcas...
ATAL
2004
Springer
14 years 2 months ago
2004
Springer
This paper develops and analyzes distributed search techniques for use in a peer-to-peer (P2P) network-based Information Retrieval (IR) system. In the absence of a centralized med...
ICDE
2007
IEEE
14 years 10 months ago
2007
IEEE
Incompleteness due to missing attribute values (aka "null values") is very common in autonomous web databases, on which user accesses are usually supported through media...