what is the {start time} for {Salman of Saudi Arabia} has {position held} as {King of Saudi Arabia} ?
Salman of Saudi Arabia has position held as King of Saudi Arabia beginning at what time?
Which is the  start time for Salman of Saudi Arabia has position held as King of Saudi Arabia ?
SELECT ?o WHERE { ?r property:position_held resource:King_of_Saudi_Arabia . ?r property:start_time ?o . resource:Salman_of_Saudi_Arabia property:position_held ?r }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q367825> .
?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/Q850168> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q367825 p:P39 ?s . ?s ps:P39 wd:Q850168 . ?s pq:P580 ?value}