On Thu, May 25, 2006 at 04:54:09PM -0400, Merlin Moncure wrote:
>> select a,b,(select c from t t2 order by c desc where t1.a=t2.a and
>> t1.b=t2.b)
>> from t t1 group by a,b;
> this came out to a tie with the group by approach, although it
> produced a different (but similar) plan. we are still orders of
> magnitude behind mysql here.
Actually, it _should_ produce a syntax error -- it's missing a LIMIT 1 in the
subquery.
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