Re: how to sort an array and remove duplicate in plpgsql

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От Chris Coleman
Тема Re: how to sort an array and remove duplicate in plpgsql
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Msg-id 538A2AED987D2F458E7FDDAEE5E1E13525021E@secure.eurocom.me.uk
обсуждение исходный текст
Ответ на how to sort an array and remove duplicate in plpgsql  ("David Gagnon" <david.gagnon@cesart.com>)
Список pgsql-general
Hi,
 
I'm no postgres guru and am not sure if this is the accepted way or not, but:
 
CREATE OR REPLACE FUNCTION explode_array(in_array anyarray)
RETURNS SETOF anyelement AS
$BODY$
    SELECT ($1)[s] FROM generate_series(1, array_upper($1, 1)) AS s;
$BODY$
LANGUAGE 'sql' IMMUTABLE;
ALTER FUNCTION explode_array(in_array anyarray) OWNER TO postgres;
Then you could do:
 
SELECT DISTINCT explode_array(ARRAY[1, 2, 5, 3, 1, 2]) AS data ORDER BY data
 
==>
 
1,
2,
3,
5
 
Hope that helps,
 
Cheers
Chris


From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of David Gagnon
Sent: 26 February 2007 14:16
To: pgsql-general@postgresql.org
Subject: [GENERAL] how to sort an array and remove duplicate in plpgsql

Hi all,

  I’m messing up with this problem for a while and I searched the web without success.  I have an array of timestamp and I needed sorted and I need to remove duplicate value.  The Select statement offers the SORT BY and UNIQUE that may help me but so far I didn’t find the way to plug my array variable into the select and get back the sorted array in return.

Any help or clue will be really appreciated!

Regards

David

 

 




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