Re: How to notice column changes in trigger

Hello Christoph Haller ,


> >
> > >So you want the trigger executed only if assignments to b and/or c do

Do sime thing like this  use if /then /esle s block for the problem

In the first if blick check that b and c is null by the declaration of 
IS NULL after that you run the update command as required 

The program code will show as

create function 
CREATE FUNCTION BLAH_FUNCTION() RETURNS "trigger"   AS ' 
usual blah blah of declre and all ,


IF NEW.b IS NULL and NEW.C IS NULL THEN
ROCK BABY
ELSE
Do OTHERWISE
END IF;
more blah blah plpgsql';



CREATE TRIGGER BLAH   BEFORE  UPDATE ON BLAH_TABLE   FOR EACH ROW   EXECUTE PROCEDURE BLAH_FUNCTION



Please revert back if this helps .


Regards
V Kashyap

> > >not appear within the update command. Right?
> > >
> >
> > Right, that's what I want.
> >
> I'm afraid I have no idea how to accomplish that.
> 
> Regards, Christoph
> 
> 
> 
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