What is the {human} for {designed by} of {Structured Query Language}
Who planned Organized Inquiry Language?
Who designed Structured Query Language?
SELECT DISTINCT ?j WHERE { resource:Structured_Query_Language property:designed_by ?j . ?j rdf:type ontology:human }
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/P287> . ?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:P287 ?obj . ?obj wdt:P31 wd:Q5 } 
Donald D. Chamberlin