Re: ALTER TABLE modifications

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От
Dave Cramer
Тема
Re: ALTER TABLE modifications
Дата
Msg-id
1068825571.1625.197.camel@localhost.localdomain
Ответ на
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Дерево обсуждения
ALTER TABLE modifications Rod Taylor <pg@rbt.ca>
Re: ALTER TABLE modifications Hannu Krosing <hannu@tm.ee>
Re: ALTER TABLE modifications Bruce Momjian <pgman@candle.pha.pa.us>
Re: ALTER TABLE modifications Tom Lane <tgl@sss.pgh.pa.us>
Re: ALTER TABLE modifications Rod Taylor <pg@rbt.ca>
Re: ALTER TABLE modifications Peter Eisentraut <peter_e@gmx.net>
Re: ALTER TABLE modifications Rod Taylor <pg@rbt.ca>
Re: ALTER TABLE modifications Peter Eisentraut <peter_e@gmx.net>
Re: ALTER TABLE modifications Rod Taylor <pg@rbt.ca>
Re: ALTER TABLE modifications Hannu Krosing <hannu@tm.ee>
Re: ALTER TABLE modifications Dave Cramer <pg@fastcrypt.com>
Re: ALTER TABLE modifications Rod Taylor <pg@rbt.ca>
Re: ALTER TABLE modifications Peter Eisentraut <peter_e@gmx.net>
Re: ALTER TABLE modifications Rod Taylor <pg@rbt.ca>
Re: ALTER TABLE modifications Tom Lane <tgl@sss.pgh.pa.us>
Re: ALTER TABLE modifications Christopher Kings-Lynne <chriskl@familyhealth.com.au>
Re: ALTER TABLE modifications Peter Eisentraut <peter_e@gmx.net>
Re: ALTER TABLE modifications Hannu Krosing <hannu@tm.ee>
Re: ALTER TABLE modifications Tom Lane <tgl@sss.pgh.pa.us>
Re: ALTER TABLE modifications Dave Cramer <pg@fastcrypt.com>
Re: ALTER TABLE modifications Rod Taylor <pg@rbt.ca>
Re: ALTER TABLE modifications Alvaro Herrera <alvherre@dcc.uchile.cl>
Re: ALTER TABLE modifications Hannu Krosing <hannu@tm.ee>
Re: ALTER TABLE modifications Christopher Kings-Lynne <chriskl@familyhealth.com.au>
Re: ALTER TABLE modifications Hannu Krosing <hannu@tm.ee>
Re: ALTER TABLE modifications Peter Eisentraut <peter_e@gmx.net>
OK,

Here is another approach, that would retain column order. It will
require that the table be locked while this proceeds, but I think this
is a good idea anyway.

lock table
create newtable as select c1, c2, c3::newtype
modify pg_class to point to the new filename
modify existing pg_attribute for the column in question
recreate indexes that exist on the column
unlock table

Dave

On Fri, 2003-11-14 at 09:57, Peter Eisentraut wrote:
> Rod Taylor writes:
> 
> > The method is rename old column, add new column, move data across, move
> > or reform dependencies, drop old column.
> 
> I can do this by hand.  If we have an explicit command to do it, then it
> needs to preserve the table schema.  Else, this feature would be mostly
> useless and a certain source of complaints.

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