PREFIX dst: PREFIX dc: SELECT (bif:year( bif:stringdate(?sdate)) AS ?syear) (bif:sum( bif:number(?dist)) AS ?distance) FROM WHERE { ?row dc:date ?sdate . ?row dst:distance ?dist } GROUP BY (bif:year(bif:stringdate(?sdate))) ORDER BY ASC(bif:year(bif:stringdate(?sdate)));