How many {costume designer} are to/by {Christian Dior} ?
How many fashion designers work for Christian Dior?
How many clothing designers work for Christian Dior?
SELECT ( COUNT ( ?l ) AS ?o ) { ?l property:costume_designer resource:Christian_Dior }
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/P2515> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q159694 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P2515 wd:Q159694 }
10