Count Distinct in a Group By aggregate function in Access 2007 SQL

Question

Hello I have browsed the forum for a while and am asking my first question here. I\'m in a bit of a bind and was wondering if I could get some help out. I am using Access 20

Answer 1

This works in Access 2007 and 2010:

select format(sum(bpa_ext_price) /
              (select count(*) from (select distinct ord_num from sales)),
             "standard") AS Avg_Ord_Amt
from   sales