Re: Updating a specific number of rows in pl/pgsql

On Mon, 10 Aug 2009 17:52:36 -0700
"Peter Headland" <pheadland(at)actuate(dot)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);

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