Oracle - GROUP BY with rollup with titles

Oracle-Group by rollup with titles.sql

SELECT
  CASE
    WHEN GROUPING(REGION) = 1 THEN 'TOTAL GENERAL'
    ELSE REGION
  END AS REGION,
  CASE
    WHEN GROUPING(PRODUCTO) = 1 THEN 'TOTAL REGIÓN'
    ELSE PRODUCTO
  END AS PRODUCTO,
  SUM(IMPORTE) AS TOTAL_VENTAS
FROM VENTAS
GROUP BY ROLLUP(REGION, PRODUCTO)
ORDER BY REGION, PRODUCTO;