188 search results - page 2 / 38 » Query evaluation with soft-key constraints |
SSD
2007
Springer
13 years 11 months ago
2007
Springer
In this paper we study the evaluation of continuous constraint queries (CCQs) for spatiotemporal streams. A CCQ triggers an alert whenever a configuration of constraints between s...
ICDT
2003
ACM
13 years 10 months ago
2003
ACM
We study extensions of first-order logic over the reals with different types of transitive-closure operators as query languages for constraint databases that can be described by...
SIGMOD
2008
ACM
13 years 5 months ago
2008
ACM
Tree pattern queries (TPQs) provide a natural and easy formalism to query tree-structured XML data, and the efficient processing of such queries has attracted a lot of attention. ...
ICDE
2009
IEEE
14 years 7 months ago
2009
IEEE
Many location-based services require rich and expressive query language support for filtering large amounts of information. In prominent location-based services thousands of conti...
ICDE
1999
IEEE
14 years 6 months ago
1999
IEEE
We develop a data integration approach for the efficient evaluation of queries over autonomous source databases. The approach is based on some novel applications and extensions of...