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Re: Trigger :Add an old value with the new value
Posted by: Peter Brawley
Date: January 21, 2021 11:05AM

There seems to be a design problem---you will need to keep a record of an individual's current payment, and also a record of her total payments; the usual solution is to keep a total_paid column in an `account` table, store individual payments in another `transactions` table, and update the account sum when there are new transactions. Then a Trigger on transactions would say ...

update account
set total_paid = total_paid + new.paid
where account_id=new.account_id;

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Re: Trigger :Add an old value with the new value
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January 21, 2021 11:05AM


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