Question: How many teams have used the stadium which hosted the WCW mayhem?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { <http://dbpedia.org/resource/WCW_Mayhem> prop:venue ?x . ?x onto:tenant ?uri  . ?x rdf:type onto:Stadium}