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Editorial Team
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Asked: 2026-05-22T12:05:05+00:00

How do I calculate and update the refundamt? I have these three rows initially

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How do I calculate and update the refundamt?

I have these three rows initially in database:

NO  |  TRANAMT  |  REFUNDAMT
1   |  100      |  0 
2   |  200      |  0
3   |  300      |  0

If refund is 350, the refundamt will be updated as follow, the refundamt cannot be more then the tranamt:

NO  |  TRANAMT  |  REFUNDAMT
1   |  100      |  100 
2   |  200      |  200
3   |  300      |  50

When refund again with 50, it will only update the last record, the refundamt will be updated as follow:

NO  |  TRANAMT  |  REFUNDAMT
1   |  100      |  100 
2   |  200      |  200
3   |  300      |  100
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1 Answer

  1. Editorial Team

    Here’s a simple algorithm (not considering multithreading and locks):

    1. Let RF be the total refund
    2. Find the first row where REFUNDAMT < TRANAMT and call it ROW
    3. Calculate the difference DIFF for ROW: DIFF = TRANAMT – REFUNDAMT
      • If DIFF >= RF, update REFUNDAMT in ROW to REFUNDAMT+RF and you are done.
      • If DIFF < RF, update REFUNDAMT in ROW to TRANAMT, let RF = RF-DIFF and go to step 2.
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