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

SELECT 
      E1.F_Name AS A, 
      P1.Project_Name AS B, 
      Count(A1.Act_ID) AS C, 
      sum( IF( A1.Status IN ( 'Closed', 'OnHold' ), 0, 1 )) as D,
      (Count(A1.Act_ID) / sum( IIF( A1.Status IN ( 'Closed', 'OnHold' ), 0, 1 ))) * 100 as E
   FROM 
      ATT_Table A1
         JOIN Employee_Table E1
            ON A1.Assigned_To_ID = E1.Emp_ID
         JOIN Project_Table P1
            ON A1.Project_ID = P1.Project_ID
   GROUP BY 
      F_Name, Project_Name;