183 search results - page 2 / 37 » An Abstract Framework for Generating Maximal Answers to Quer... |
SIGMOD
2001
ACM
14 years 5 months ago
2001
ACM
We study the problem of generating e cient, equivalent rewritings using views to compute the answer to a query. We take the closed-world assumption, in which views are materialize...
IJCAI
2003
13 years 6 months ago
2003
Information integration systems provide a uniform query interface to a set of sources. One of the key challenges for an information integration system is to provide maximally comp...
PVLDB
2010
13 years 3 months ago
2010
This paper addresses the problem of explaining missing answers in queries that include selection, projection, join, union, aggregation and grouping (SPJUA). Explaining missing ans...
PODS
2009
ACM
14 years 5 months ago
2009
ACM
d Abstract) Andrea Cal`i2,1 , Georg Gottlob1,2 , and Thomas Lukasiewicz1, 1 Computing Laboratory, University of Oxford, UK firstname.lastname@comlab.ox.ac.uk 2 Oxford-Man Institute...
AAAI
2010
13 years 6 months ago
2010
Conjunctive query answering is a key reasoning service for many ontology-based applications. In order to improve scalability, many Semantic Web query answering systems give up com...