Question: Count all those who've played for the youth club which owns the Rosario, Santa Fe stadium.
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x prop:ground <http://dbpedia.org/resource/Rosario,_Santa_Fe> . ?uri prop:youthclubs ?x . }