On 04/01/2012 11:45 AM, Albert wrote:
*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.
What is the error message?
does that because i have to use BEFORE ? what if i need to execute the
procedure after updating column and it has really changed.*
Depends what the procedure is doing. For more detail on what the WHEN
does in BEFORE and AFTER triggers see here:
http://www.postgresql.org/docs/9.0/interactive/sql-createtrigger.html
Look for the Notes section.
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Adrian Klaver
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