This is the problem. I couldn't create it.
The Sample Data (B) supposed to be:
EmpID, ArrivalDate, DepartureDate, Workdays
1, 16/7/2003, 25/5/2004, 314 days
1, 15/8/2004, 18/6/2007, 1037 days
But I don't want to store the workdays in table or query, I only want to show in the form in a...