How many {screenwriter} are to/by {Aldous Huxley} ?
How many screenwriters are by Aldous Huxley?
SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P58 wd:Q81447 }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P58> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q81447 .
} 

Aldous Huxley wrote how many screenplays?