what is the {start time} for {Emmerson Mnangagwa} has {educated at} as {University of Zambia} ?
What year did Emmerson Mnangagwa start at the University of Zambia?
When did Emmerson Mnangagwa begin going to the University of Zambia?
SELECT ?t WHERE { resource:Emmerson_Mnangagwa property:educated_at ?q . ?q property:start_time ?t . ?q property:educated_at resource:University_of_Zambia }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q510523> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P69> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q2096836> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q510523 p:P69 ?s . ?s ps:P69 wd:Q2096836 . ?s pq:P580 ?value}