What is {has moon} of {parent body} of {Ring Nebula} ?
Which planets have moons in the Ring Nebula?
Which planets in the Ring Nebula have moons?
SELECT ?h WHERE { ?l property:child_astronomical_body ?h . resource:Ring_Nebula property:parent_astronomical_body ?l }
SELECT ?answer WHERE { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q13969> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P397>. ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?X . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?X. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P398> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer . }
SELECT ?answer WHERE { wd:Q13969 wdt:P397 ?X . ?X wdt:P398 ?answer}