text: SELECT  a.Name,sum(il.UnitPrice)  ,c.CustomerId,c.FirstName,c.LastName
  FROM Artist a
  JOIN ALBUM al
  ON a.ArtistId=al.ArtistId
  JOIN Track t
  ON al.AlbumId=t.AlbumId
  JOIN InvoiceLine il
  ON il.TrackId=t.TrackId
  JOIN Invoice i
  ON il.InvoiceId=i.InvoiceId
  JOIN Customer c
  ON c.CustomerId=i.CustomerId
  WHERE a.ArtistId=90
  GROUP BY 1,3,4,5
  ORDER BY 2 DESC
  