what is the {race time} for {Wayde van Niekerk} has {participant of} as {2015 World Championships in Athletics – Men's 400 metres} ?
What was the final year in which Wayde van Niekerk has a partecipant of 2015 World Championships in Athletics - Men's 400 metres?)
What is the final time for Wayde van Niekerk has a partecipant of 2015 World Championships in Athletics - Men's 400 metres?)
SELECT ?v WHERE { ?q property:participant_in resource:2015_World_Championships_in_Athletics_–_men's_400_metres . resource:Wayde_van_Niekerk property:participant_in ?q . ?q property:race_time ?v }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q16855376> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1344> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q20798444> .
?statement <http://www.wikidata.org/entity/P2781> ?value. 
} 

SELECT ?value WHERE { wd:Q16855376 p:P1344 ?s . ?s ps:P1344 wd:Q20798444 . ?s pq:P2781 ?value}