Re: How to count the number of items in an Array?

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От Andre Lopes
Тема Re: How to count the number of items in an Array?
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Msg-id 18f98e681002210746j5840cf1cie04bc9c65075a023@mail.gmail.com
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Ответ на Re: How to count the number of items in an Array?  (Andreas Kretschmer <akretschmer@spamfence.net>)
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Hi,
 
Thanks for the reply.
 
I have done it in this way:
 
[code]
    FOR vDISTRITOS_NA_TABELA IN
     SELECT array[id_distrito] FROM am_newsletter_distritos
     WHERE email = pEMAIL and id_website_recolha = pID_WEBSITE_RECOLHA   
  LOOP
     vDISTRITOS_NA_TABELA_CONST := vDISTRITOS_NA_TABELA_CONST || vDISTRITOS_NA_TABELA;
    END LOOP;
[/code]
 
Best Regards,


 
On Sun, Feb 21, 2010 at 3:25 PM, Andreas Kretschmer <akretschmer@spamfence.net> wrote:
Andre Lopes <lopes80andre@gmail.com> wrote:

> One more time, thanks for the reply. I'am using postgre 8.3. I think I don't
> have the array_agg(), there is another way of doing it?

Sure.

The doc contains an example for a user-defined aggregate-function:
http://www.postgresql.org/docs/8.4/interactive/xaggr.html

It works with versions prior 8.4.


test=*# CREATE AGGREGATE array_accum (anyelement)
test-# (
test(#     sfunc = array_append,
test(#     stype = anyarray,
test(#     initcond = '{}'
test(# );
CREATE AGGREGATE
Zeit: 44,645 ms
test=*# select array_accum(a) from foo;
 array_accum
-------------
 {1,3,5,7}
(1 Zeile)



Andreas
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