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Using Array-Values in subselect

From: Alvar Freude <alvar(dot)freude(at)merz-akademie(dot)de>
To: pgsql-sql(at)postgresql(dot)org
Subject: Using Array-Values in subselect
Date: 2000-11-14 20:51:59
Message-ID: 3A11A5EF.C74A40EE@merz-akademie.de (view raw or flat)
Thread:
Lists: pgsql-sql
Hi,

i want to create a linked structure of values. Each text has an id, an
array of children ids and the value itself.

  CREATE TABLE structure
    (
    id int8,
    children int8[],
    value text
    );

Now i want to select all values which are connected to a given parent #x
at once. My first idea was this:

  SELECT value 
  FROM structure
     WHERE id IN (SELECT children FROM structure WHERE id = #x);

But this causes an error because the array field just returns a string
instead of seperated values. Is there a way to make arrays return sort
of "real arrays" or something usable in a subselect in reasonable speed?


Thank you
Alvar



-- 
Alvar C.H. Freude  |  alvar(dot)freude(at)merz-akademie(dot)de

    Demo: http://www.online-demonstration.org/  |  Mach mit!
Blast-DE: http://www.assoziations-blaster.de/   |  Blast-Dich-Fit
Blast-EN: http://www.a-blast.org/               |  Blast/english

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Subject: Re: Using Array-Values in subselect
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