What is {spouse} of {Howard Hughes} that is {start time} is {1957-1-12} ?
Who was Howard Hughes married to in 1957?
Who was Howard Hughes spouse in December 1957?
SELECT ?t WHERE { resource:Howard_Hughes property:spouse ?l . ?l property:spouse ?t . FILTER ( CONTAINS ( YEAR ( ?p ) , '1957' ) ) . ?l property:start_time ?p }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q189081> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P26> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1957-1-12>
} 

SELECT ?obj WHERE { wd:Q189081 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1957')) }