How many {producer} are for {Gladiator} ?
What is the number of producers for Gladiator?
How many producer for Gladiator?
SELECT ( COUNT ( ?q ) AS ?o ) { resource:Gladiator property:producer ?q }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q128518> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P162> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q128518 wdt:P162 ?obj }
4