Question: Which pole driver of 1989 Portuguese Grand Prix was also the first driver of 1993 European Grand Prix ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/1993_European_Grand_Prix> <http://dbpedia.org/property/firstDriver> ?uri. <http://dbpedia.org/resource/1989_Portuguese_Grand_Prix> <http://dbpedia.org/ontology/poleDriver> ?uri}