# filename: ex126.rq

PREFIX ab: <http://learningsparql.com/ns/addressbook#>

SELECT ?lname ?courseName 
FROM <ex069.ttl> 
FROM NAMED <ex125.ttl>
FROM NAMED <ex122.ttl> # unnecessary

WHERE
{
  { ?student ab:lastName ?lname }
  UNION
  { GRAPH <ex125.ttl> { ?course ab:courseTitle ?courseName } }
}