- SELECT g.name,
- COUNT(t.track_id)
- FROM track AS t
- INNER JOIN invoice_line AS il ON t.track_id=il.track_id
- INNER JOIN invoice AS i ON i.invoice_id=il.invoice_id
- INNER JOIN track ON t.track_id = il.track_id
- INNER JOIN genre AS g ON t.genre_id = g.genre_id
- GROUP BY g.name -- добавьте поле для группировки
- ORDER BY COUNT(t.track_id) DESC