Обсуждение: 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



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> -----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.