617 search results - page 42 / 124 » Semantic queries in databases: problems and challenges |
SIGMOD
2005
ACM
14 years 9 months ago
2005
ACM
A windowed query operator breaks a data stream into possibly overlapping subsets of data and computes results over each. Many stream systems can evaluate window aggregate queries....
SIGMOD
2004
ACM
14 years 9 months ago
2004
ACM
We study the problem of answering queries through a target schema, given a set of mappings between one or more source schemas and this target schema, and given that the data is at...
SIGMOD
2002
ACM
14 years 9 months ago
2002
ACM
Recently several important relational database tasks such as index selection, histogram tuning, approximate query processing, and statistics selection have recognized the importan...
DEXA
2004
Springer
14 years 2 months ago
2004
Springer
Data integration is a significant challenge: relevant data objects are split across multiple information sources, and often owned by different organizations. The sources represent...
CORR
2011
Springer
13 years 15 days ago
2011
Springer
The integration of reasoning and computation services across system and language boundaries has been mostly treated from an engineering perspective. In this paper we take a foundat...