617 search results - page 8 / 124 » Semantic queries in databases: problems and challenges |
LPNMR
2009
Springer
14 years 2 months ago
2009
Springer
Abstract. We study the complexity of consistency checking and query answering on incomplete databases for languages ranging from non-recursive Datalog to disjunctive Datalog with n...
PODS
2010
ACM
14 years 19 days ago
2010
ACM
Both semantic and type-based query optimization rely on the idea that queries often exhibit non-trivial rewritings if the state space of the database is restricted. Despite their ...
ICDE
2007
IEEE
14 years 1 months ago
2007
IEEE
In this paper, we study the problem of auditing a batch of SQL queries: given a set of SQL queries that have been posed over a database, determine whether some subset of these quer...
ER
2004
Springer
14 years 28 days ago
2004
Springer
The envisioned Semantic Web aims to provide richly annotated and explicitly structured Web pages in XML, RDF, or description logics, based upon underlying ontologies and thesauri. ...
SYRCODIS
2007
13 years 8 months ago
2007
In this paper we consider the problem of efficiently producing results for full-text keyword search queries over XML documents. We describe full-text search query semantics and pr...