Question: Who designed the stadiums which have been rented by Oakland athletics?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/tenant> <http://dbpedia.org/resource/Oakland_Athletics> . ?x <http://dbpedia.org/property/architect> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Stadium>}