Using old value in calculation...

Hello again,

If I have for example the senario below

Debtor credit balance Emp_name

Ahmad 200.00 $ $30.00-$170.00

Ahmad $50.00 400.00-$ 180.00

such that the value of the balance in the second row is calculated as: credit - debit + old balance = 400 - 50 + (-170) = 180.

If I want to express this in my trigger, is it correct to write it like this:

: New.Balance: =: New.Credit -: New.Debit +: old. Balance;

And what happens if we do not have old balance, as for the original line?

Any background?

Thank you very much in advance...

Your requirement seems incomplete. You have to tell us what you want to do when you don't have an old value. Check if this helps you. It's about old value 0 if you do not.

SELECT THE CREDIT + DEBIT + LAG (BALANCE, 1, 0) (PARTITION SORT ENAME ENAME) OF TABLE;

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