Postgres Pro
Downloads
Home   >   mailing lists

Re: Using CTID system column as a "temporary" primary key - Mailing list pgsql-general

From Sebastien Flaesch
Subject Re: Using CTID system column as a "temporary" primary key
Date
Msg-id DBAP191MB128940FF558474BC6DA80CB7B0889@DBAP191MB1289.EURP191.PROD.OUTLOOK.COM
Whole thread Raw
In response to Re: Using CTID system column as a "temporary" primary key  (Christophe Pettus <xof@thebuild.com>)
Responses Re: Using CTID system column as a "temporary" primary key
List pgsql-general
Tree view
CAST seems to do the job so that's a good solution here.

Seb
From: Christophe Pettus <xof@thebuild.com>
Sent: Tuesday, March 28, 2023 2:39 PM
To: Sebastien Flaesch <sebastien.flaesch@4js.com>
Cc: Geoff Winkless <pgsqladmin@geoff.dj>; pgsql-general <pgsql-general@lists.postgresql.org>
Subject: Re: Using CTID system column as a "temporary" primary key
 
EXTERNAL: Do not click links or open attachments if you do not recognize the sender.

> On Mar 28, 2023, at 03:39, Sebastien Flaesch <sebastien.flaesch@4js.com> wrote:
> Do I have to cast() ?

Yes:

        select * from t where ctid='(0,1)'::tid;

The string representation can be up to 17 characters: 10 for the page number, 4 for the tuple number, and three for the delimiters.

Remember that updating a row changes its CTID.

pgsql-general by date:

Previous
From: Adrian Klaver
Date:
Subject: Re: Plans for ON DELETE CASCADE? Which index is used, if at all?
Next
From: Adrian Klaver
Date:
Subject: Re: Cluster table based on grand parent?