what is the {point in time} for {Brasília} has {population} as {2.61e+06} ?
At the time of 2.61e+06, what was the population of Brasilla?
What was the population in Brasilla at the time of 2.61e+06?
SELECT ?a WHERE { ?s property:point_in_time ?a . FILTER ( ?c = 2.61e+06 ) . ?s property:population ?c . resource:Brasília property:population ?s }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2844> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1082> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <2.61e+06> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q2844 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '2.61e+06')) . ?s pq:P585 ?value}