Matthew Wakeling <matthew@flymine.org> wrote:
> I'm trying to eke a little bit more performance out of an
> application
In addition to the suggestion from Thomas Kellerer, it would be
interesting to try the following and see how performance compares
using real data.
select group, value from tbl x
where not exists
(select * from tbl y
where y.group = x.group and y.number > x.number);
We have a lot of code using this general technique, and I'm curious
whether there are big gains to be had by moving to the windowing
functions. (I suspect there are.)
-Kevin
