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We introduce the database fragment of RDF, which extends the popular Description Logic fragment, in particular with support for incomplete information. We then provide novel sound and complete saturation-and reformulation-based techniques for answering the Basic Graph Pattern queries of SPARQL in this fragment. Notably, we extend the state of the art on pushing RDF query processing within robust / efficient relational database management systems. Finally, we experimentally compare our querydoi:10.1145/2187980.2188104 dblp:conf/www/GoasdoueMR12 fatcat:fl2qaxoaxfbh5gqciiwtthwuum