What is <EC ID> of <copper> ?
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Which is the EC ID of copper?
SELECT DISTINCT ?k WHERE { resource:copper property:EC_number ?k }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q753> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P232> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q753 wdt:P232 ?answer}
231-159-6