SQL & PL/SQL

Hi all,

select
id
,one
,two
From
(select id
, one
, two
, Max(decode(TYPE, "ER", 3*4, 4*7)
from
(select id
, sum(one) as one
, sum(two) as two
from t1
group by id)
group by id, one, two
) temp inner join t2....

The above query is just a sample structure to tell the problem that i am facing. It works fine, but i need to convert it to ANSI Standard.

Hence I need to convert the DECODE to CASE statement. but if i convert to CASE, i need to use any of the GROUP BY FUNCTIONS, but if i use the MAX of any group by functions, the result would be wrong...how to overcome it

Thanks