What is {discoverer or inventor of} of {B-tree}, that has {awarded} is {Officer's Cross of the Order of Merit of the Federal Republic of Germany} ?
What German inventor came up with the B-tree and awarded the Officer's Cross of the Order of Merit?
Who was the inventor of the B-tree, who was awarded the Officer's Cross of the Order of Merit of the Federal Republic of Germany?
SELECT ?b WHERE { resource:B-tree property:discoverer_or_inventor ?b . ?b property:award_received resource:Officer's_Cross_of_the_Order_of_Merit_of_the_Federal_Republic_of_Germany }
SELECT ?answer WHERE { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q677051> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P61>. ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?answer. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P166> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q10905334> . }
SELECT ?answer WHERE { wd:Q677051 wdt:P61 ?answer . ?answer wdt:P166 wd:Q10905334}
Rudolf Bayer