From: | Jaime Casanova <jcasanov(at)systemguards(dot)com(dot)ec> |
---|---|
To: | Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Writeable CTEs and side effects |
Date: | 2009-10-07 21:16:20 |
Message-ID: | 3073cc9b0910071416r1413fb55vc536cf98a2e5033f@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On Wed, Oct 7, 2009 at 4:08 PM, Marko Tiikkaja
<marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi> wrote:
>
> 1) WITH t AS
> (UPDATE foo SET bar = bar+1 RETURNING *)
> SELECT * FROM t LIMIT 1;
>
> What's problematic here is that only 1 row is read from the CTE, meaning
> also that only one row is updated which, at least how I see it, is not
> what we want. The CTE should only store one row and return that after
> it has completely processed the UPDATE statement.
>
i'm talking from my ignorance... but AFAIU this should process the
whole UPDATE and then form a WorkTable with the results...
what the select reads from that results is another thing...
--
Atentamente,
Jaime Casanova
Soporte y capacitación de PostgreSQL
Asesoría y desarrollo de sistemas
Guayaquil - Ecuador
Cel. +59387171157
From | Date | Subject | |
---|---|---|---|
Next Message | Brad T. Sliger | 2009-10-07 21:18:58 | Re: Unicode UTF-8 table formatting for psql text output |
Previous Message | Marko Tiikkaja | 2009-10-07 21:08:03 | Writeable CTEs and side effects |