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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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