what is the {series ordinal} for {J. Robert Oppenheimer} has {given name} as {Julius} ?
On what date did J. Robert Oppenheimer begin as Julius in the series?
When did J. Robert Oppenheimer begin the series as Julius?
SELECT ?b WHERE { ?j property:given_name resource:Julius . ?j property:series_ordinal ?b . resource:Robert_Oppenheimer property:given_name ?j }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q132537> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P735> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1102114> .
?statement <http://www.wikidata.org/entity/P1545> ?value. 
} 

SELECT ?value WHERE { wd:Q132537 p:P735 ?s . ?s ps:P735 wd:Q1102114 . ?s pq:P1545 ?value}