Re: ORDER BY and LIMIT with SubSelects - Mailing list pgsql-performance

On Wed, Jan 21, 2004 at 09:18:18 -0800,
  Ron St-Pierre <rstpierre@syscor.com> wrote:
>
> My question is in regards to steps 2 and 3 above. Is there some way that
> I can combine both steps into one to save some time?

TIP 4: Don't 'kill -9' the postmaster
SELECT SS.* FROM
(SELECT DISTINCT ON (nonUniqField)
 first, second, third, cost, payDate, nonUniqField
 FROM histdata
 WHERE userID = 19048 AND cost IS NOT NULL
 ORDER BY nonUniqField, payDate DESC LIMIT 200
)
SS
ORDER BY payDate;