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

["Chris Coleman" <ChristopherC@xxxxxxxxxxxxx>]

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@xxxxxxxxxxxxxx [mailto:pgsql-general-owner@xxxxxxxxxxxxxx] On Behalf Of David Gagnon
Sent: 26 February 2007 14:16
To: pgsql-general@xxxxxxxxxxxxxx
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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