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Re: Turning a subselect into an array

From: "Jim C(dot) Nasby" <decibel(at)decibel(dot)org>
To: Michael Fuhr <mike(at)fuhr(dot)org>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Turning a subselect into an array
Date: 2004-10-29 22:13:02
Message-ID: 20041029221302.GU55164@decibel.org (view raw or flat)
Thread:
Lists: pgsql-docspgsql-general
Ok, next stupid question that I can't find in the docs... How would I
join a table to an array? IE: if I have an array of primary keys for
some table and I want to get the name field from that table and turn it
back into an array, how would I do that?

On Thu, Oct 28, 2004 at 05:21:52PM -0600, Michael Fuhr wrote:
> On Thu, Oct 28, 2004 at 05:37:29PM -0500, Jim C. Nasby wrote:
> > I'm sure this has been answered before, but the search seems to be down
> > again.
> > 
> > How can I convert the results of a subselect into an array? IE:
> > 
> > CREATE TABLE a(a int, b int, c int[]);
> > INSERT INTO table_a
> >     SELECT a, b, (SELECT c FROM table_c WHERE table_c.parent = table_b.id)
> >         FROM table_b
> 
> See the "Array Constructors" section in the PostgreSQL documentation:
> 
> http://www.postgresql.org/docs/7.4/static/sql-expressions.html#SQL-SYNTAX-ARRAY-CONSTRUCTORS
> 
> INSERT INTO table_a
>   SELECT a, b, ARRAY(SELECT c FROM table_c WHERE table_c.parent = table_b.id)
>   FROM table_b
> 
> -- 
> Michael Fuhr
> http://www.fuhr.org/~mfuhr/
> 
> ---------------------------(end of broadcast)---------------------------
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> 

-- 
Jim C. Nasby, Database Consultant               decibel(at)decibel(dot)org 
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