What is the {Ritchey–Chrétien telescope} with the {MAX(observing time available)} whose {operator} is {European Southern Observatory}  ?
In the European Southern Observatory, which Ritchey-Chretien telescope possesses the most observing time?
Which Ritchey–Chrétien telescope in the European Southern Observatory has the most observing time available?
SELECT ?e WHERE { ?e property:observing_time_available ?m . ?e rdf:type ontology:Ritchey–Chrétien_telescope . ?e property:operator resource:European_Southern_Observatory }
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q1062138>.

?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P3891>.
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj1.

?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P137> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q151991> .

}
ORDER BY DESC(?obj1)
LIMIT 5
select ?ent where { ?ent wdt:P31 wd:Q1062138 . ?ent wdt:P3891 ?obj . ?ent wdt:P137 wd:Q151991 } ORDER BY DESC(?obj)LIMIT 5 
Very Large Telescope