*I'm trying to follow this :*
CREATE TRIGGER check_update
*BEFORE* UPDATE ON accounts
FOR EACH ROW
WHEN (OLD.balance IS DISTINCT FROM NEW.balance)
EXECUTE PROCEDURE check_account_update();
*but with AFTER instead of BEFORE. and I'm keep getting error on or near
WHEN.
does that because i have to use BEFORE ? what if i need to execute the
procedure after updating column and it has really changed.*
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