Re: delete column

From: Mathieu Arnold <mat(at)mat(dot)cc>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: Lincoln Yeoh <lyeoh(at)pop(dot)jaring(dot)my>, "Hillensbeck, Preston" <PHillensbeck(at)sfbcic(dot)com>, 'webmaster' <webmaster(at)harbornet(dot)com>, "'pgsql-general(at)postgresql(dot)org'" <pgsql-general(at)postgresql(dot)org>
Subject: Re: delete column
Date: 2002-04-27 16:52:23
Message-ID: 4126034.1019933543@tot.in.t-online.fr
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--On samedi 27 avril 2002 11:08 -0400 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
>>> Oops my mistake! I actually didn't use select into to create the
>>> table, because I didn't want the columns exactly the same as before -
>>> was switching from varchar to text.
>
>> Oh, yes, that makes sense for your case. You can't control the data
>> types with SELECT INTO.
>
> You could with an explicit cast:
>
> SELECT varcharcol::text INTO newtable FROM ...

I really think that :
CREATE new (all without the one(s) we don't want and their defaults)
INSERT INTO new select ... from old;
DROP old;
ALTER TABLE new RENAME TO old;

is the better.

--
Mathieu Arnold

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