What is {spouse} of {Marika Rökk} that is {start time} is {1968-1-1} ?
Who was Marika Rokk married to in January 1, 1968?
Who was the spouse of Marika Rokk in 1968-1-1?
SELECT ?d WHERE { FILTER ( CONTAINS ( YEAR ( ?x ) , '1968' ) ) . ?d property:spouse ?d . resource:Marika_Rökk property:spouse ?d . ?d property:start_time ?x }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q48502> .
?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> <1968-1-1>
} 

SELECT ?obj WHERE { wd:Q48502 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1968')) }