Question: Which actor was casted in the most movies?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX res: <http://dbpedia.org/resource/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT DISTINCT ?uri 
WHERE {
        ?uri rdf:type onto:Actor .
        ?f rdf:type onto:Film .
        ?f onto:starring ?uri .
} 
ORDER BY DESC(COUNT(DISTINCT(?f))) 
OFFSET 0 LIMIT 1