function-based index for SUM(field) and GROUP BY

I have a SQL-Statement which looks like: SELECT A, B, SUM(C), SUM(D)
FROM MYTABLE
GROUP BY A, B
Is it possible to enhance the performance by creating a function-based index say

CREATE INDEX BLA ON MYTABLE
(SUM(C),SUM(D) GROUP BY A, B)
TABLESPACE IND ... curious Thomas Received on Thu Jun 26 2003 - 07:07:51 CDT