From: Peter Headland <pheadland@actuate.com>
To: D'Arcy J.M. Cain <darcy@druid.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: Updating a specific number of rows in pl/pgsql
Date: Tue, 11 Aug 2009 09:55:36 -0700
Message-ID: <71F491F5DA99604A80DE49424BF3D02B0C7292D8@exchange8.actuate.com> (raw)
In-Reply-To: <20090811062503.86993bf6.darcy@druid.net>
References: <71F491F5DA99604A80DE49424BF3D02B0C7290CA@exchange8.actuate.com>
<20090811062503.86993bf6.darcy@druid.net>
>Assuming that there is a unique identifier on queue
Alas, there is not. The PK is made up of 4 columns.
--
Peter Headland
Architect
Actuate Corporation
-----Original Message-----
From: D'Arcy J.M. Cain [mailto:darcy@druid.net]
Sent: Tuesday, August 11, 2009 03:25
To: Peter Headland
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] Updating a specific number of rows in pl/pgsql
On Mon, 10 Aug 2009 17:52:36 -0700
"Peter Headland" <pheadland@actuate.com> wrote:
> I can get the rows I want to update like this:
>
> SELECT *
> FROM queue
> WHERE id = p_queue_id
> ORDER BY rank
> LIMIT p_number_of_items;
>
> Of course, there may not be p_number_of_items available in the queue.
>
> I want to update all the rows in the cursor in the same way:
>
> UPDATE queue SET assigned = TRUE;
Assuming that there is a unique identifier on queue, let's call it
queue_id, you should be able to do something like this:
UPDATE queue SET assigned = TRUE
WHERE queue_id IN (SELECT queue_id
FROM queue
WHERE id = p_queue_id
ORDER BY rank
LIMIT p_number_of_items);
--
D'Arcy J.M. Cain <darcy@druid.net> | Democracy is three wolves
http://www.druid.net/darcy/ | and a sheep voting on
+1 416 425 1212 (DoD#0082) (eNTP) | what's for dinner.
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To: pgsql-sql@postgresql.org
Cc: pheadland@actuate.com, darcy@druid.net
Subject: Re: Updating a specific number of rows in pl/pgsql
In-Reply-To: <71F491F5DA99604A80DE49424BF3D02B0C7292D8@exchange8.actuate.com>
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