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

Answer 2

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;

Answer 3

You mentioned Product_Table, but I don't see how that table is involved in your question. For the rest, I would pull columns A, B, C, and D from a subquery, and compute E in the outer query.

SELECT
    sub.F_Name AS A,
    sub.Project_Name AS B,
    sub.C,
    sub.D,
    ((sub.C / sub.D) * 100) AS E
FROM
    (
        SELECT
            Emp.F_Name,
            Proj.Project_Name,
            Count(att.Act_ID) AS C,
            Sum(IIf(att.Status IN ('New', 'InProcess'), 1, 0)) AS D
        FROM
            (ATT_Table AS att
            INNER JOIN Employee_Table AS Emp
            ON Emp.Emp_ID = att.Assigned_To_ID)
            INNER JOIN Project_Table AS Proj
            ON Proj.Project_ID = att.Project_ID 
        GROUP BY
            Emp.F_Name,
            Proj.Project_Name
    ) AS sub;