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» Optimization of Complex Nested Queries in Relational Databas...
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IJSWIS
2008
135views more  IJSWIS 2008»
13 years 7 months ago
Efficient Processing of RDF Queries with Nested Optional Graph Patterns in an RDBMS
Relational technology has shown to be very useful for scalable Semantic Web data management. Numerous researchers have proposed to use RDBMSs to store and query voluminous RDF dat...
Artem Chebotko, Shiyong Lu, Mustafa Atay, Farshad ...
PODS
2010
ACM
249views Database» more  PODS 2010»
14 years 16 days ago
Semantic query optimization in the presence of types
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 ...
Michael Meier 0002, Michael Schmidt, Fang Wei, Geo...
CSR
2007
Springer
14 years 1 months ago
Marrying Words and Trees
Traditionally, data that has both linear and hierarchical structure, such as annotated linguistic data, is modeled using ordered trees and queried using tree automata. In this pap...
Rajeev Alur
DEXA
2005
Springer
112views Database» more  DEXA 2005»
14 years 1 months ago
Distribution Rules for Array Database Queries
Abstract. Non-trivial retrieval applications involve complex computations on large multi-dimensional datasets. These should, in principle, benefit from the use of relational datab...
Alex van Ballegooij, Roberto Cornacchia, Arjen P. ...