What is {characters} of {Nabucco} that is {voice type} is {soprano} ?
In Nabucco, which characters sing as sopranos?
What characters in Nabucco sing as sopranos?
SELECT ?h WHERE { ?c property:voice_type resource:soprano . ?c property:characters ?h . resource:Nabucco property:characters ?c }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q202230> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P674> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P412> <http://wikidata.dbpedia.org/resource/Q30903>
} 

SELECT ?obj WHERE { wd:Q202230 p:P674 ?s . ?s ps:P674 ?obj . ?s pq:P412 wd:Q30903 }