SELECT c, i, y, m, r
FROM book_sales s
WHERE s.year IN (2002, 2003)
MODEL

   PARTITION BY (country c)
   DIMENSION BY (isbn i, year y, month m)
   MEASURES (s.net_revenue r)
   RULES ( 
      r['1-56592-948-9',2004,1] = ROUND(
         ((r['1-56592-948-9',2003,1] - r['1-56592-948-9',2002,1])
           / r['1-56592-948-9',2002,1]) * r['1-56592-948-9',2003,1]

         + r['1-56592-948-9',2003,1],2))
ORDER BY c, i, y, m;