Re: Updating

Would it be possible to get an example of such coding??

Bob

----- Original Message -----
From: "Adrian Klaver" <aklaver(at)comcast(dot)net>
To: <pgsql-general(at)postgresql(dot)org>
Cc: "Bob Pawley" <rjpawley(at)shaw(dot)ca>
Sent: Sunday, March 16, 2008 5:14 PM
Subject: Re: [GENERAL] Updating

> On Sunday 16 March 2008 3:32 pm, Bob Pawley wrote:
>> Is there a method available for triggering a function after an update on
>> a
>> particular column in a table?
>>
>> The only way that I have found is to trigger after an update on the whole
>> table, which of course can lead to problems.
>>
>> Bob
>
> I trigger can be constrained to fire for each row. Inside the trigger
> function
> you can test to see if the column in question has been updated and do the
> appropriate thing. If the column has not been changed do nothing and
> RETURN
> NEW which makes the function non-op.
> --
> Adrian Klaver
> aklaver(at)comcast(dot)net
>
> --
> Sent via pgsql-general mailing list (pgsql-general(at)postgresql(dot)org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-general