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

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;