On 5/25/06, Bruno Wolff III <bruno@xxxxxxxx> wrote:
On Thu, May 25, 2006 at 16:07:19 -0400, Merlin Moncure <mmoncure@xxxxxxxxx> wrote: > been doing a lot of pgsql/mysql performance testing lately, and there > is one query that mysql does much better than pgsql...and I see it a > lot in normal development: > > select a,b,max(c) from t group by a,b; >
SELECT DISTINCT ON (a, b) a, b, c FROM t ORDER BY a DESC, b DESC, c DESC;
that is actually slower than group by in my case...am i missing something? (both essentially resolved to seq_scan) merlin
