Question: Count the number of first drivers in all the GPs where Mika Hakkinen was a first driver?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:poleDriver <http://dbpedia.org/resource/Mika_Häkkinen> . ?x onto:firstDriver ?uri  . ?uri rdf:type onto:RacingDriver}