Question: Which music albums contain the song Last Christmas?
SPARQL:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX onto: <http://dbpedia.org/ontology/> SELECT DISTINCT ?uri ?string WHERE { ?single rdf:type onto:Single . ?single onto:album ?uri . ?single foaf:name 'Last Christmas'@en . OPTIONAL {?uri rdfs:label ?string . FILTER (lang(?string) = 'en') } }