What is {population} of {Lille} that is {point in time} is {2015-1-1} ?
In January 2015, what was the population of Lille?
What was the population in Lille as of January 1, 2015?
SELECT ?j WHERE { resource:Lille property:population ?v . ?v property:point_in_time ?k . FILTER ( CONTAINS ( YEAR ( ?k ) , '2015' ) ) . ?v property:population ?j }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q648> .
?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> ?obj .
?statement <http://www.wikidata.org/entity/P585> <2015-1-1>
} 

SELECT ?obj WHERE { wd:Q648 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2015')) }