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A relational algebra for SPARQL
Cyganiak, Richard
HPL-2005-170
Keyword(s): RDF; semantic web; databases; query
Abstract: The SPARQL query language for RDF provides Semantic Web developers with a powerful tool to extract information from large datasets. This report describes a transformation from SPARQL into the relational algebra, an abstract intermediate language for the expression and analysis of queries. This makes existing work on query planning and optimization available to SPARQL implementors. A further translation into SQL is outlined, and mismatches between SPARQL semantics and the relational approach are discussed.
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