Question: How many other people are in a band with Robert de Niro?
SPARQL:
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/currentMembers> <http://dbpedia.org/resource/Robert_De_Niro> . ?x <http://dbpedia.org/ontology/bandMember> ?uri  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}