24 search results - page 4 / 5 » Answering Keyword Queries involving Aggregates and GROUPBY o... |
GIS
2010
ACM
13 years 3 months ago
2010
ACM
This paper proposes an efficient, decentralized algorithm for determining the topological relationship between two regions monitored by a geosensor network. Many centralized algo...
SIGMOD
2006
ACM
14 years 5 months ago
2006
ACM
We study the problem of finding efficient equivalent viewbased rewritings of relational queries, focusing on query optimization using materialized views under the assumption that ...
SENSYS
2004
ACM
13 years 10 months ago
2004
ACM
Wireless sensor networks offer the potential to span and monitor large geographical areas inexpensively. Sensors, however, have significant power constraint (battery life), makin...
SIGMOD
2010
ACM
13 years 10 months ago
2010
ACM
Many advanced data management operations (e.g., incremental maintenance, trust assessment, debugging schema mappings, keyword search over databases, or query answering in probabil...
GIS
2002
ACM
13 years 5 months ago
2002
ACM
The focus of this paper is on interoperability issues to achieve data integration in distributed databases for geographic applications. Our concrete application is in the context ...