what is the {start time} for {Omar Bongo} has {position held} as {Vice President of Gabon} ?
When did Omar Bongo begin his position as Bad habit President of Gabon?
When did Omar Bongo start his position as Vice President of Gabon?
SELECT ?f WHERE { resource:Omar_Bongo property:position_held ?v . ?v property:position_held resource:Vice_President_of_Gabon . ?v property:start_time ?f }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q172083> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P39> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q17030478> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q172083 p:P39 ?s . ?s ps:P39 wd:Q17030478 . ?s pq:P580 ?value}