what is the {academic degree} for {William Vickrey} has {educated at} as {Yale University} ?
What degree did William Vickrey received at Yale University
SELECT ?value WHERE { wd:Q295673 p:P69 ?s . ?s ps:P69 wd:Q49112 . ?s pq:P512 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q295673> .
?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/Q49112> .
?statement <http://www.wikidata.org/entity/P512> ?value. 
} 

What did William Vickrey graduate for at Yale University?