Question: Count the total number of launch site of the rockets which have been launched form Cape Canaveral Air Force Station ?
SPARQL:
 SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/launchSite> <http://dbpedia.org/resource/Cape_Canaveral_Air_Force_Station> . ?x <http://dbpedia.org/ontology/launchSite> ?uri }