what is the {start time} for {Saarland} has {head of government} as {Oskar Lafontaine} ?
At what point in time did Oskar Lafontaine become the head of the government of Saarland?
When did Oskar Lafontaine become the head of the government of Saarland?
SELECT ?b WHERE { resource:Saarland property:head_of_government ?j . ?j property:start_time ?b . ?j property:head_of_government resource:Oskar_Lafontaine }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1201> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P6> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q110719> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q1201 p:P6 ?s . ?s ps:P6 wd:Q110719 . ?s pq:P580 ?value}