selects on datetime

Hello all,

I have a table w/ a field of type datetime. I would like to do something
like:
select count(jobs) for every day of a particular month and year.

my current select statement is:
Select count(job_id) from jobs where date_part('month',sub_dt)=2 and
date_part('year',sub_dt)=1999 and date_
part('day',sub_dt)=?";

I then execute the statement filling the placeholder with days 1..31

There has to be a better way to do this since the select has to go through
every row in the table. Any ideas?

thanks,
scot b.