public inbox for [email protected]  

help / color / mirror / Atom feed

From: Jim C. Nasby <[email protected]>
To: Michael Fuhr <[email protected]>
Cc: [email protected]
Subject: Re: Turning a subselect into an array
Date: Fri, 29 Oct 2004 17:13:02 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

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)---------------------------
> TIP 7: don't forget to increase your free space map settings
> 

-- 
Jim C. Nasby, Database Consultant               [email protected] 
Give your computer some brain candy! www.distributed.net Team #1828

Windows: "Where do you want to go today?"
Linux: "Where do you want to go tomorrow?"
FreeBSD: "Are you guys coming, or what?"

view thread (5+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected]
  Subject: Re: Turning a subselect into an array
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox