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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
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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  (Maciek Sakrejda <m.sakrejda@gmail.com>)
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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
 
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> 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.

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