How many {presenter} are to/by {Adriano Celentano} ?
Which is the number of presenters that are held by Adriano Celentano?
How many presenters are held in the {Adriano Celentano} ?
SELECT ( COUNT ( ?i ) AS ?q ) { ?i property:presenter resource:Adriano_Celentano }
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/P371> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q199943 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P371 wd:Q199943 }
1