Question: Who all are starring in the  movies where director of photography is John Derek ?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/cinematography> <http://dbpedia.org/resource/John_Derek> . ?x <http://dbpedia.org/property/starring> ?uri . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Film>}