What is {population} of {Samara} that is {point in time} is {1890-1-1} ?
What was the population of Samara in 1890?
What is {population} of {Samara} whose {point in time} is {1890-1-1} ?
SELECT ?j WHERE { resource:Samara property:population ?g . ?g property:point_in_time ?d . FILTER ( CONTAINS ( YEAR ( ?d ) , '1890' ) ) . ?g property:population ?j }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q894> .
?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> <1890-1-1>
} 

SELECT ?obj WHERE { wd:Q894 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1890')) }