Question: Which rivers flow into a German lake?
SPARQL:
PREFIX dbo: <http://dbpedia.org/ontology/>
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 dbo:River .
        ?x dbo:inflow ?uri .
        ?x rdf:type dbo:Lake . 
        ?x dbo:country res:Germany .
}