Question: How many space missions have there been?
SPARQL:
PREFIX res: <http://dbpedia.org/resource/> PREFIX dbo: <http://dbpedia.org/ontology/> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT COUNT(DISTINCT ?uri) WHERE { ?uri rdf:type dbo:SpaceMission . }