On Wed, Sep 18, 2002 at 13:09:07 -0700,
Laurette Cisneros <laurette@nextbus.com> wrote:
>
> Aren't aggregates smart enough to use an index on the column? This takes 8
> minutes to run! I can't see that I should have to build a functional index
> (is it possible for an aggregate?) to get this to run faster?
I don't believe a functional index would work for an aggregate.
The way to do this is to use an order by clause and a limit 1 clause.
This has been discussed a lot on the lists and you should be able to find
more details in the archives.