What is {population} of {Crimean Peninsula} that is {point in time} is {1989-1-1} ?
What was the population of the Crimean Peninsula in 1989?
What is {population} of {Crimean Peninsula} where {point in time} is {1989-1-1} ?
SELECT ?v WHERE { ?j property:point_in_time ?k . FILTER ( CONTAINS ( YEAR ( ?k ) , '1989' ) ) . ?j property:population ?v . resource:Crimea property:population ?j }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q7835> .
?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> <1989-1-1>
} 

SELECT ?obj WHERE { wd:Q7835 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1989')) }