On 2025-04-21 18:12:13 +0200, Thiemo Kellner wrote:
> I wonder if that is a corner case. Updating a unique key sounds to me like a
> design flaw in the first place.
I agree that changing a surrogate key is almost always a mistake.
But there might be situations where a column should be unique but
Thanks for the pointer. I feel my doubts reflected. For such reasons, I prefer
the UUID as surrogate key. No point in trying to establish an order or even id
arithmetics.
21.04.2025 18:44:27 Adrian Klaver :
> On 4/21/25 09:12, Thiemo Kellner wrote:
>> I wonder if that is a corner case. Updating
On 4/21/25 09:12, Thiemo Kellner wrote:
I wonder if that is a corner case. Updating a unique key sounds to me like a
design flaw in the first place.
Check out this the thread below for discussion on that topic:
https://www.postgresql.org/message-id/dkbnfi$7g5$1...@sea.gmane.org
--
Adrian Kl
I wonder if that is a corner case. Updating a unique key sounds to me like a
design flaw in the first place.
On 4/21/25 01:47, Peter J. Holzer wrote:
If the hash was the other way around it wouldn't work.
So let's try if we can get the optimizer to flip the plan by changing
the number of updated rows.
[a few minutes later]
#v+
hjp=> explain
with a as (select id from id_update where id > 9 order
On 2025-04-20 08:28:22 -0700, Adrian Klaver wrote:
> On 4/20/25 02:10, Peter J. Holzer wrote:
> > I've just read Laurenz' blog post about the differences between Oracle
> > and PostgreSQL[1].
> >
> > One of the differences is that something like
> >
> > UPDATE tab SET id = id + 1;
> >
> > t
On 4/20/25 02:10, Peter J. Holzer wrote:
I've just read Laurenz' blog post about the differences between Oracle
and PostgreSQL[1].
One of the differences is that something like
UPDATE tab SET id = id + 1;
tends to fail on PostgreSQL because the the primary key constraint is
checked for ev
Might that be a feature of or a flaw in the application design? I opt for the
latter. Any application that needs updates, be it only in emergency cases,
should take that into account.
On Sun, Apr 20, 2025 at 5:35 AM Thiemo Kellner
wrote:
> Very interesting. But is the sort overhead worth it? Why not make the
> constraint deferrable before the update and switch back afterwards?
>
The role which runs the UPDATE might not have the priv to ALTER TABLE ...
ALTER CONSTRAINT.
--
D
Hm, deadlocks preventing order by. Never had that problem. Then again, I mostly
have Oracle experience and no need for complicated updates. If I had, I'd
rather think of chunking updates and orchestrate those before ordering within
updates.
On 2025-04-20 11:34:56 +0200, Thiemo Kellner wrote:
> Very interesting. But is the sort overhead worth it? Why not make the
> constraint deferrable before the update and switch back afterwards?
Mostly idle curiosity whether that's possible at all.
But there might be other reasons why you want to
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