Re: Alter column to type serial

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От Alvaro Herrera
Тема Re: Alter column to type serial
Дата
Msg-id 1288887115-sup-2736@alvh.no-ip.org
обсуждение исходный текст
Ответ на Alter column to type serial  (Thom Brown <thom@linux.com>)
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Excerpts from Thom Brown's message of jue nov 04 09:05:01 -0300 2010:

> This would be instead of having to do:
> 
> CREATE SEQUENCE id_stuff_seq;
> 
> SELECT setval('id_stuff_seq', (SELECT max(id) FROM stuff))
> 
> ALTER TABLE stuff ALTER COLUMN id SET DEFAULT
> nextval('id_stuff_seq'::regclass);
> 
> Which would also mean the sequence would not get dropped with the table.

You can fix that with an ALTER SEQUENCE OWNED BY.

> Abhorrent idea, or acceptable?

I think the problem is in locking the table against futher insertions
while you do the setval.

-- 
Álvaro Herrera <alvherre@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support


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