From: David Fetter <david@fetter.org>
To: Marc G. Fournier <scrappy@postgresql.org>
Cc: pgsql-hackers@postgresql.org
Subject: Re: ALTER TABLE ( smallinto -> boolean ) ...
Date: Mon, 29 Aug 2005 16:24:45 -0700
Message-ID: <20050829232445.GE13074@fetter.org> (raw)
In-Reply-To: <20050829201253.X1044@ganymede.hub.org>
References: <20050829201253.X1044@ganymede.hub.org>
On Mon, Aug 29, 2005 at 08:15:41PM -0300, Marc G. Fournier wrote:
>
> I have a table with several 'smallint' fields that I'd like to convert to
> booleean ... the data in each is either 0 or 1, and:
>
> # select '1'::boolean;
> bool
> ------
> t
> (1 row)
> # select '0'::boolean;
> bool
> ------
> f
> (1 row)
>
> so they do cast as expected ... but, if I try to do the ALTER, I get:
>
> # ALTER TABLE table ALTER COLUMN field1 type boolean;
> ERROR: column "field1" cannot be cast to type "pg_catalog.bool"
> Should this not work? If not, is there a way to do it so that it will,
> without having to reload the whole table?
ALTER TABLE "table" ALTER COLUMN field1 TYPE boolean
USING CASE field1 WHEN 0 THEN false ELSE true END;
/* or something to this effect */
HTH :)
Cheers,
D
--
David Fetter david@fetter.org http://fetter.org/
phone: +1 510 893 6100 mobile: +1 415 235 3778
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To: pgsql-sql@postgresql.org
Cc: david@fetter.org, scrappy@postgresql.org, pgsql-hackers@postgresql.org
Subject: Re: ALTER TABLE ( smallinto -> boolean ) ...
In-Reply-To: <20050829232445.GE13074@fetter.org>
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