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Re: PgSQL problem: How to split strings into rows

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Kynn Jones <kynnjo@xxxxxxxxx> wrote:

> I have a table X with some column K consisting of whitespace-separated words.  
> Is there some SELECT query that will list all these words (for the entire
> table) so that there's one word per row in the returned table?  E.g.  If the
> table X is
> 
>            K
> ---------------------
>  foo bar baz
>  quux frobozz
>  eeny meeny
>  miny moe
> 
> ...I want the result of this query to be
> 
>  foo
>  bar
>  baz
>  quux
>  frobozz
>  eeny
>  meeny
>  miny
>  moe
> 
> How can I do this?  (I have a slight preference for solutions that will work
> with version 8.2, but I'm interested in any solution to the problem.)

With 8.4:

test=*# select string_to_array('foo bar bartz', ' ');
 string_to_array
-----------------
 {foo,bar,bartz}
(1 Zeile)

Zeit: 23,390 ms
test=*# select unnest(string_to_array('foo bar bartz', ' '));
 unnest
--------
 foo
 bar
 bartz
(3 Zeilen)


With 8.2:

You have to create a function unnest:

CREATE OR REPLACE FUNCTION unnest(ANYARRAY) RETURNS SETOF ANYELEMENT
LANGUAGE SQL AS $$SELECT $1[i] FROM
generate_series(array_lower($1,1),array_upper($1,1)) i;$$;

string_to_array() should work in 8.2 (i'm not really sure, but i think,
8.2 contains this funtion)



Andreas
-- 
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect.                              (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly."   (unknown)
Kaufbach, Saxony, Germany, Europe.              N 51.05082°, E 13.56889°

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