Need help for my SQL query

Question

Well I may have posted this earlier also, but unable to find the answer so far, so please help me on this one.

My database structure:

ATT (

Answer 1

Maybe like this. try it....

Select Emp.F_Name As A,
  Proj.Project_Name As B,
  Count(ATT.Act_ID) As C,
  sum( IIF( ATT.Status IN ( 'Closed', 'OnHold' ), 0, 1 )) as D,
  (Count(ATT.Act_ID) / sum( IIF( ATT.Status IN ( 'Closed', 'OnHold' ), 0, 1 ))) * 100 as E 
From Employee_Table As Emp Inner Join
  (Product_Table As Prod Inner Join
  (ATT_Table As ATT Inner Join Project_Table As Proj On Proj.Project_ID=ATT.Project_ID) 
  On Prod.Product_ID=ATT.Product_ID) 
  On Emp.Emp_ID=ATT.Assigned_To_ID
Group By Emp.F_Name,Proj.Project_Name