121 search results - page 14 / 25 » On Containment of Conjunctive Queries with Negation |
CORR
2010
Springer
13 years 7 months ago
2010
Springer
An answer to a query has a well-defined lineage expression (alternatively called how-provenance) that explains how the answer was derived. Recent work has also shown how to comput...
ADBIS
2004
Springer
14 years 1 months ago
2004
Springer
Abstract. Query rewriting method is proposed for the heterogeneous information integration infrastructure formed by the subject mediator environment. Local as View (LAV) approach t...
ICDE
2006
IEEE
14 years 9 months ago
2006
IEEE
We present MiniCount, the first efficient sound and complete algorithm for finding maximally contained rewritings of conjunctive queries with count, using conjunctive views with c...
SEMWEB
2009
Springer
14 years 2 months ago
2009
Springer
An important application of semantic web technology is recognizing human-defined concepts in text. Query transformation is a strategy often used in search engines to derive querie...
PODS
1997
ACM
13 years 12 months ago
1997
ACM
We consider the problem of answering datalog queries using materialized views. The ability to answer queries using views is crucial in the context of information integration. Prev...