From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | David Fetter <david(at)fetter(dot)org> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jaime Casanova <systemguards(at)gmail(dot)com>, pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: BUG #2051: CREATE TEMP TABLE AS SELECT doesn't play nice |
Date: | 2005-11-22 23:20:37 |
Message-ID: | 200511222320.jAMNKb102634@candle.pha.pa.us |
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Thread: | |
Lists: | pgsql-bugs |
TODO has:
o Add ON COMMIT capability to CREATE TABLE AS ... SELECT
---------------------------------------------------------------------------
David Fetter wrote:
> On Thu, Nov 17, 2005 at 05:32:43PM -0500, Tom Lane wrote:
> > David Fetter <david(at)fetter(dot)org> writes:
> > > On Thu, Nov 17, 2005 at 04:37:14PM -0500, Tom Lane wrote:
> > >> CREATE TEMP TABLE foo ... ON COMMIT DROP;
> >
> > > It's that first little elipsis mark that's the problem. Is there
> > > something really clever I've been missing on how to do a dynamic
> > > table creation?
> >
> > Oh, you're worried about what to do if you don't know the output
> > column set of the query? OK, that is a bit harder, but I think it's
> > still a corner case. How much are you really going to get done with
> > the table if you don't know what columns it has?
>
> My use case is when I have a system of audit tables that look like
> this:
>
> CREATE TABLE foo (
> ...
> );
>
> CREATE TABLE foo_audit (
> foo_audit_id BIGSERIAL PRIMARY KEY,
> foo_actor TEXT,
> foo_timestamp TIMESTAMP,
> foo_action char(1) CHECK foo_action IN('D','I','U'),
> old_foo foo,
> new_foo foo
> );
>
> with appropriate TRIGGERs, etc. to make that happen. It nice feature
> of being partitionable via constraint exclusion.
>
> This is in aid of a system for making it possible to ALTER foo while
> preserving the data in foo_audit.
>
> Cheers,
> D
> --
> David Fetter david(at)fetter(dot)org http://fetter.org/
> phone: +1 510 893 6100 mobile: +1 415 235 3778
>
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Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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