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Re: [GENERAL] 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, pgsql-docs(at)postgresql(dot)org
Subject: Re: [GENERAL] Turning a subselect into an array
Date: 2004-10-30 06:07:37
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-docspgsql-general
Thanks again for the help. I did manage to find that after a bunch of
searching in the mailing list. There should really be a portion of the
docs dedicated to array handling.

On Fri, Oct 29, 2004 at 10:40:57PM -0600, Michael Fuhr wrote:
> On Fri, Oct 29, 2004 at 05:13:02PM -0500, Jim C. Nasby wrote:
> > 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?
> See the "Subquery Expressions" and "Row and Array Comparisons"
> sections in the PostgreSQL documentation:
> If I understand you correctly, this should work:
> A test I just ran showed "id = ANY(ARRAY[1,2,3])" doing a sequential
> scan whereas "id IN (1,2,3)" did an index scan, so you might want to
> use the latter if possible.
> -- 
> Michael Fuhr
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Jim C. Nasby, Database Consultant               decibel(at)decibel(dot)org 
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