Hi,
Thanks for all the helpful suggestions everyone!
Cheers,
Seb
On Tue, 26 Apr 2011 10:32:59 +1200,
"Brent Wood" <b.wood@niwa.co.nz> wrote:
> Hi Seb, Use CASE to change nulls to empty strings (or a placeholder)
> as below.
> See:
> http://www.postgresql.org/docs/9.0/static/functions-conditional.html
> if you want a placeholder in the result to indicate the presence of a
> null, try the second SQL:
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> test=# select (case when 'a' isnull then '' else 'a' end) || (case
> when 'b' isnull then '' else 'b' end) || (case when NULL is null then
> '' end); ?column? ---------- ab (1 row)
> test=# select (case when 'a' isnull then '_' else 'a' end) || (case
> when 'b' isnull then '_' else 'b' end) || (case when NULL is null then
> '_' end); ?column? ---------- ab_ (1 row)
> test=#
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> HTH,
> Brent Wood
> Brent Wood DBA/GIS consultant NIWA, Wellington New Zealand
>>>> Seb <spluque@gmail.com> 04/26/11 10:21 AM >>>
> Hi,
> A query such as:
> SELECT 'a' || 'b' || NULL;
> returns a NULL. How can I ensure I get 'ab' in the result? I'm trying
> to concatenate columns and one of them might have NULL values, which I
> simply want to ignore.
> Cheers,
> -- Seb
> Please consider the environment before printing this email.
> NIWA is the trading name of the National Institute of Water &
> Atmospheric Research Ltd.
--
Seb
