Which clubs play in the La Liga?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/league> <http://dbpedia.org/resource/La_Liga> . ?x <http://dbpedia.org/property/name> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/SoccerClub>}
La_Liga