I try to use SQL wherever possible, but in this case, it may be very
difficult if possible.  As I understand it, you're trying to sum fields in
a record which are not externally described to allow SQL to identify them.

If you ultimately decide to try RPG native file access be sure to check out
the BLOCK(*YES) keyword.  In some cases it can increase straight reads from
a file.  Using the Blocking effectively is sometimes what appears to give
SQL the advantage.  If it were me I'd try it with and without to see if
there was any difference.

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