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Considere a seguinte consulta SQL:
SELECT al.titleFROM album alJOIN track t ON al.AlbumId = t.AlbumIdGROUP BY al.AlbumIdHAVING AVG(t.Milliseconds) > ALL ( SELECT t2.Milliseconds FROM track t2 JOIN genre g ON t2.GenreId = g.GenreId WHERE g.name = 'Rock');