How many {chairperson} are to/by {Donald Trump} ?
Of how many companies is Donald Trump a chairperson?
SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P488 wd:Q22686 }
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/P488> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q22686 .
} 

Donald Trump is a chairperson of how many companies?