297 search results - page 13 / 60 » On the Decidability of Consistent Query Answering |
PODS
2004
ACM
14 years 8 months ago
2004
ACM
We study the problem of answering queries over sources with limited access patterns. Given a first-order query Q, the problem is to decide whether there is an equivalent query whi...
PODS
2005
ACM
14 years 8 months ago
2005
ACM
Abstract. We present a semantics and answer set programs for relational peer data exchange systems. When a peer answers a query, it exchanges data with other peers in order to supp...
EDBTW
2004
Springer
14 years 1 months ago
2004
Springer
The problem of answering queries posed to a peer who is a member of a peer-to-peerdataexchangesystemisstudied.Theanswershavetobeconsistentwrt to both the local semantic constraints...
EUSFLAT
2009
13 years 6 months ago
2009
This paper proposes an approach aimed at obviating empty answers for a family of conjunctive queries involving Boolean or fuzzy value constraints. Contrary to the approaches based ...
PODS
1999
ACM
14 years 22 days ago
1999
ACM
Semistructured data occur in situations where information lacks a homogeneous structure and is incomplete. Yet, up to now the incompleteness of information has not been re ected b...