995 search results - page 129 / 199 » Optimization of Complex Nested Queries in Relational Databas... |
152
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WWW
2011
ACM
14 years 9 months ago
2011
ACM
The problem of answering SPARQL queries over virtual SPARQL views is commonly encountered in a number of settings, including while enforcing security policies to access RDF data, ...
194
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VLDB
2007
ACM
16 years 2 months ago
2007
ACM
Estimating the cardinality (i.e. number of distinct elements) of an arbitrary set expression defined over multiple distributed streams is one of the most fundamental queries of in...
123
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CIKM
2008
Springer
15 years 4 months ago
2008
Springer
Query processing techniques for XML data have focused mainly on tree-pattern queries (TPQs). However, the need for querying XML data sources whose structure is very complex or not...
138
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SEMWEB
2009
Springer
15 years 8 months ago
2009
Springer
RDF Schema (RDFS) as a lightweight ontology language is gaining popularity and, consequently, tools for scalable RDFS inference and querying are needed. SPARQL has become recently ...
116
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DASFAA
2003
IEEE
15 years 7 months ago
2003
IEEE
Various models and approaches have been proposed for mapping XML data into relational tables recently. Most of those approaches produce relational schema for given XML data, based...