How many TV shows have executive producer as Steven Moffat ?
SELECT DISTINCT COUNT(?uri) WHERE {?uri <http://dbpedia.org/ontology/executiveProducer> <http://dbpedia.org/resource/Steven_Moffat>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/TelevisionShow>}
Steven_Moffat