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* Help in accessing array
@ 2012-09-27 10:12 mephysto <mephystoonhell@gmail.com>
0 siblings, 1 reply; 2+ messages in thread
From: mephysto @ 2012-09-27 10:12 UTC (permalink / raw)
To: pgsql-sql
Hi to everyone,
I have a little problem to retrieve data from multidimensional array. For
example, if I have this array
foo[][] = {{5,3},{2,2}}
how can I retrieve one of two internal array (for example I would to
retrieve {5,3}?
I tried foo[1:1] but the result is {{5,3}}, not {5,3}.
Is a method to achieve my goal?
Thanks in advance.
Mephysto
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* Re: Help in accessing array
@ 2012-10-02 13:53 David Johnston <polobo@yahoo.com>
parent: mephysto <mephystoonhell@gmail.com>
0 siblings, 0 replies; 2+ messages in thread
From: David Johnston @ 2012-10-02 13:53 UTC (permalink / raw)
To: 'mephysto' <mephystoonhell@gmail.com>; pgsql-sql
> -----Original Message-----
> From: pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-
> owner@postgresql.org] On Behalf Of mephysto
> Sent: Thursday, September 27, 2012 6:12 AM
> To: pgsql-sql@postgresql.org
> Subject: [SQL] Help in accessing array
>
> Hi to everyone,
> I have a little problem to retrieve data from multidimensional array. For
> example, if I have this array
>
> foo[][] = {{5,3},{2,2}}
>
> how can I retrieve one of two internal array (for example I would to
retrieve
> {5,3}?
>
> I tried foo[1:1] but the result is {{5,3}}, not {5,3}.
>
> Is a method to achieve my goal?
>
> Thanks in advance.
>
> Mephysto
IIRC
You cannot de-dimension an array (aside from the special-case single
dimension, 1 value, case). You will need to unnest the array into
components, filter those components, then go from there. Each,
"unnest(array)" call explodes one dimension. Consider wraping things in a
function to make the code cleaner.
David J.
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