what is the {start time} for {Felix Adler} has {employer} as {Columbia University} ?
When did Felix Adler start working for Columbia University?
On which year Felix Adler became an employee of Columbia University?
SELECT ?t WHERE { resource:Felix_Adler property:employer ?o . ?o property:employer resource:Columbia_University . ?o property:start_time ?t }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1386165> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P108> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q49088> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q1386165 p:P108 ?s . ?s ps:P108 wd:Q49088 . ?s pq:P580 ?value}