Question: Who all have been presenters on shows by the NBC?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/channel> <http://dbpedia.org/resource/NBC> . ?x <http://dbpedia.org/property/presenter> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/TelevisionShow>}