What is <pro-football-reference ID> of <Dick Butkus> ?
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What is Dick Butkus' pro-football-reference ID?
SELECT DISTINCT ?i WHERE { resource:Dick_Butkus property:Pro-Football-Reference.com_player_ID ?i }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q715511> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P3561> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q715511 wdt:P3561 ?answer}