How many universities are there whose country's capital is Oslo?
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/capital> <http://dbpedia.org/resource/Oslo> . ?uri <http://dbpedia.org/ontology/country> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/University>}
Oslo