What is {spouse} of {Roger Vadim} that is {start time} is {1990-12-21} ?
On 1990-12-21, who was Roger Vadim's wife?
Who was the spouse of Roger Vadim on 1990-12-21?
SELECT ?f WHERE { ?e property:spouse ?f . resource:Roger_Vadim property:spouse ?e . ?e property:start_time ?l . FILTER ( CONTAINS ( YEAR ( ?l ) , '1990' ) ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q383420> .
?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> <1990-12-21>
} 

SELECT ?obj WHERE { wd:Q383420 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1990')) }