52 search results - page 3 / 11 » SQL Nested Queries in SPARQL |
VLDB
2005
ACM
13 years 11 months ago
2005
ACM
Nested iteration is an important technique for query evaluation. It is the default way of executing nested subqueries in SQL. Although decorrelation often results in cheaper non-n...
ODBIS
2007
Springer
13 years 11 months ago
2007
Springer
Abstract. RDF Schema (RDFS) extends RDF with a schema vocabulary with a predefined semantics. Evaluating queries which involve this vocabulary is challenging, and there is not yet...
ICLP
2007
Springer
13 years 11 months ago
2007
Springer
This paper describes the dlvhex SPARQL plugin, a query processor for the upcoming Semantic Web query language standard by W3C. We report on the implementation of this languages usi...
SIGMOD
2005
ACM
13 years 11 months ago
2005
ACM
One of the most powerful features of SQL is the use of nested queries. Most research work on the optimization of nested queries focuses on aggregate subqueries. However, the solut...
DBPL
1999
Springer
13 years 10 months ago
1999
Springer