What is {date of death} of {Lech Kaczyński} that is {statement is subject of} is {2010 Polish Air Force Tu-154 crash} ?
When did Lech Kaczynski die?
What date did Lech Kaczyński die in the 2010 Polish Air Force Tu-154 crash?
SELECT ?v WHERE { ?m property:date_of_death ?v . resource:Lech_Kaczyński property:date_of_death ?m . ?m property:statement_is_subject_of resource:2010_Polish_Air_Force_Tu-154_crash }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2757> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P570> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P805> <http://wikidata.dbpedia.org/resource/Q131311>
} 

SELECT ?obj WHERE { wd:Q2757 p:P570 ?s . ?s ps:P570 ?obj . ?s pq:P805 wd:Q131311 }