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

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(at)postgresql(dot)org
[mailto:pgsql-general-owner(at)postgresql(dot)org] On Behalf Of David Gagnon
Sent: 26 February 2007 14:16
To: pgsql-general(at)postgresql(dot)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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