On Tue, 30 Jul 2002, Josh Berkus wrote:
> Folks,
>
> Anybody know a keen shortcut for the following:
>
> SELECT count(skip_date)
> FROM (SELECT DISTINCT skip_date FROM weekend_list
> WHERE ... ...) days_to_skip;
>
> That's a double aggregate, and is bound to be dog-slow.
Would that be the same as:
select count(distinct skip_date) from weekend_listwhere ...
