Re: Remove Duplicate Words from a field

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Von: Pavel Stehule <pavel.stehule@gmail.com>
An: Sukuchha Shrestha <sukuchha@yahoo.de>
CC: pgsql-general@postgresql.org
Gesendet: Montag, den 16. Mai 2011, 15:06:14 Uhr
Betreff: Re: [GENERAL] Remove Duplicate Words from a field

Hello

2011/5/16 Sukuchha Shrestha <sukuchha@yahoo.de>:
> Dear All,
> I am new to Postgresql. I have a field with lots of  dublicate words and i
> want to remove any dublicate word from that field.
> For example, if i have a field with a string " one, one, two, two, three",
> how would i get " one, two, three" only ?
> Any help is much apprecieated !
> Sukuchha


postgres=# CREATE OR REPLACE FUNCTION uniq_worlds(text)
RETURNS text AS $$
SELECT array_to_string(ARRAY(SELECT DISTINCT trim(x) FROM
unnest(string_to_array($1,',')) x),', ')
$$ LANGUAGE sql;
CREATE FUNCTION
Time: 14.281 ms
postgres=# SELECT uniq_worlds('one, two, three, one');
  uniq_worlds
─────────────────
three, two, one
(1 row)

Time: 0.817 ms

Regards

Pavel Stehule

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