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

I'm not expert in MS Access and it is quite a long time last time I have written anything for it, but this maybe will work:

SELECT cd.DiagCode, Count(cd.CustomerID)
FROM (select distinct DiagCode, CustomerID from CustomerTable) as cd 
Group By cd.DiagCode;