what is the {point in time} for {Birmingham} has {population} as {1123000} ?
When did Birmingham's population reach 1123000?
At what point in time did Birmingham have a population of 1123000?
SELECT ?h WHERE { ?c property:population ?o . ?c property:point_in_time ?h . resource:Birmingham property:population ?c . FILTER ( CONTAINS ( ?o , '1123000' ) ) }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2256> .
?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> <1123000> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q2256 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '1123000')) . ?s pq:P585 ?value}