1268 search results - page 28 / 254 » On database query languages for K-relations |
WWW
2004
ACM
14 years 8 months ago
2004
ACM
This paper describes a query algebra for queries over XML p2p databases that provides explicit mechanisms for modeling data dissemination, replication constraints, and for capturi...
JUCS
2006
13 years 7 months ago
2006
: CQL, Continuous Query Language is suitable for data stream queries. Sometimes it is better if the queries operate on relational databases and data streams simultaneously. The exe...
ICDT
2009
ACM
14 years 8 months ago
2009
ACM
The class of unions of conjunctive queries (UCQ) has been shown to be particularly well-behaved for data exchange; its certain answers can be computed in polynomial time (in terms...
ESWS
2008
Springer
13 years 9 months ago
2008
Springer
The goal of this paper is to give an overview of the basics of the theory of RDF databases. We provide a formal definition of RDF that includes the features that distinguish this m...
PODS
1991
ACM
13 years 11 months ago
1991
ACM
In this paper we characterise exactly the complexity of a set based database language called SRL, which presents a unified framework for queries and updates. By imposing simple s...