SELECT n1, n2, product as MAX_PRODUCT
FROM
(SELECT max(n1 * n2 ) over ( ) max_product, n1, n2, n1 * n2 product
 FROM
 (
  WITH DATA AS
  (SELECT replace(sys_connect_by_path(num, ','), ',') str_num
   FROM (SELECT LEVEL num FROM dual CONNECT BY LEVEL <10)
   WHERE LEVEL = 9
   START WITH num = 9
   CONNECT BY NOCYCLE PRIOR num != num
   AND LEVEL <= 9
  )
  SELECT to_number(substr(str_num,1,rn)) n1, to_number(substr(str_num,rn+1)) n2
  FROM DATA,(SELECT ROWNUM rn FROM DUAL CONNECT BY ROWNUM<=8)
 )
)
WHERE max_product = product;