What is {chief executive officer} of {Yahoo} that is {start time} is {2011-0-0} ?
When did the chief executive office of Yahoo start and who is he?
Who is the chief esecutive offier of yahoo and when did he start?
SELECT ?t WHERE { FILTER ( CONTAINS ( YEAR ( ?f ) , '2011' ) ) . ?a property:chief_executive_officer ?t . ?a property:start_time ?f . resource:Yahoo property:chief_executive_officer ?a }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q37093> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P169> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <2011-0-0>
} 

SELECT ?obj WHERE { wd:Q37093 p:P169 ?s . ?s ps:P169 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'2011')) }