Question: What are the nicknames of the people who are in Ekstraliga?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/league> <http://dbpedia.org/resource/Ekstraliga_(speedway)> . ?x <http://dbpedia.org/property/nickname> ?uri  . }
Answer: The nicknames of the people whose league is Ekstraliga are [Byki, Lions, Swallows, Sparta].