What is <RTECS number> of <calcium carbonate> ?
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Which is the RTECS number for calcium carbonate?
SELECT DISTINCT ?g WHERE { resource:calcium_carbonate property:RTECS_number ?g }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q23767> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P657> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q23767 wdt:P657 ?answer}
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