Question: How many people have trained the wrestlers who were billed in Wisconsin?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:billed <http://dbpedia.org/resource/Wisconsin> . ?x onto:trainer ?uri  . ?uri rdf:type onto:Person}