67 search results - page 4 / 14 » Describing and Utilizing Constraints to Answer Queries in Da... |
VLDB
2007
ACM
13 years 12 months ago
2007
ACM
This paper reports our first set of results on managing uncertainty in data integration. We posit that data-integration systems need to handle uncertainty at three levels, and do...
EDBT
2011
ACM
12 years 9 months ago
2011
ACM
Data integration systems offer users a uniform interface to a set of data sources. Previous work has typically assumed that the data sources are independent of each other; however...
GIS
2007
ACM
14 years 6 months ago
2007
ACM
Accurate and efficient integration of geospatial data is an important problem with applications in areas such as emergency response and urban planning. Some of the key challenges ...
VLDB
1997
ACM
13 years 10 months ago
1997
ACM
The goal of a mediator system is to provide users a uniform interface to the multitude of information sources. To translate user queries, given in a mediated schema, to queries on...
DKE
2010
13 years 5 months ago
2010
We describe the Consistency Extractor System (ConsEx) that computes consistent answers to Datalog queries with negation posed to relational databases that may be inconsistent with...