What is the {human} for {developer} of {Structured Query Language}
Structured Query Language was created by?
Who developed Structured Query Language?
SELECT DISTINCT ?e WHERE { ?e rdf:type ontology:human . resource:Structured_Query_Language property:developer ?e }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q47607> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P178> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q5> } 
 select distinct ?obj where { wd:Q47607 wdt:P178 ?obj . ?obj wdt:P31 wd:Q5 } 
Raymond F. Boyce Donald D. Chamberlin