From: george young <gry@ll.mit.edu>
To: pgsql-sql@postgresql.org
Subject: Re: how to convert relational column to array?
Date: Mon, 19 Dec 2005 12:12:11 -0500
Message-ID: <20051219121211.002f7e87.gry@ll.mit.edu> (raw)
In-Reply-To: <20051219165449.GA99764@winnie.fuhr.org>
References: <20051219110612.26de2268.gry@ll.mit.edu>
<20051219165449.GA99764@winnie.fuhr.org>
On Mon, 19 Dec 2005 09:54:49 -0700
Michael Fuhr <mike@fuhr.org> threw this fish to the penguins:
> On Mon, Dec 19, 2005 at 11:06:12AM -0500, george young wrote:
> > create table new_tab(name text, id int, permits text[]);
> >
> > -- I insert one row per name:
> > insert into new_tab select distinct name,id,cast('{}' as text[]) from old_tab;
> >
> > Now I want to fold all the 'permits' values into the new permits arrays.
>
> In PostgreSQL 7.4 and later you can build an array from a select,
> so I think the following update should work (it did for me when I
> tested it):
>
> UPDATE new_tab SET permits = array(
> SELECT permits
> FROM old_tab
> WHERE old_tab.name = new_tab.name AND old_tab.id = new_tab.id
> );
That's exactly what I needed. Works great.
Thanks,
George
--
"Are the gods not just?" "Oh no, child.
What would become of us if they were?" (CSL)
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To: pgsql-sql@postgresql.org
Cc: gry@ll.mit.edu
Subject: Re: how to convert relational column to array?
In-Reply-To: <20051219121211.002f7e87.gry@ll.mit.edu>
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