200 search results - page 22 / 40 » Datalog Queries of Set Constraint Databases |
EDBT
2009
ACM
14 years 2 months ago
2009
ACM
Materialized views (MV) can significantly improve the query performance of relational databases. In this paper, we consider MVs to optimize complex scenarios where many heterogen...
PODS
2005
ACM
14 years 7 months ago
2005
ACM
Owners of sources registered in an information integration system, which provides answers to a (potentially evolving) set of client queries, need to know their contribution to the...
TC
1997
13 years 8 months ago
1997
In this paper we describe a new approach to repairing violations of integrity constraints in databases with null values. By adopting basic concepts from model-based diagnosis, we ...
PODS
1997
ACM
13 years 11 months ago
1997
ACM
We rework parts of the classical relational theory when the underlying domain is a structure with some interpreted operations that can be used in queries. We identify parts of the...
GLOBE
2009
Springer
14 years 1 hour ago
2009
Springer
Abstract. We show how to specify and use the metadata for a virtual and relational data integration system under the local-as-view (LAV) approach. We use XML and RuleML for represe...