What is <Eu-football.info player ID> of <John Charles> ?
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Wich means{Eu-football.info player ID} at {John Charles} ?
SELECT DISTINCT ?a WHERE { resource:John_Charles property:EU-Football.info_player_ID ?a }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q312404> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P3726> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q312404 wdt:P3726 ?answer}