How many {presenter} are to/by {Dick Clark} ?
What is the number of Presentations Dick Clark Gave?
How many presentations did Dick Clark give?
SELECT ( COUNT ( ?a ) AS ?f ) { ?a property:presenter resource:Dick_Clark }
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/Q366563 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P371 wd:Q366563 }
11