Bereken dagen Aanwezig en afwezig in de tabel

Je kunt de onderstaande vraag proberen:

SELECT e.comp_mkey, e.status,   e.resig_date,   dt_of_leave,    e.emp_name,
   e.date_of_joining,  e.emp_card_no,   a.pl_days,    pl_days_opening,    a.month1,
   a.month2,   a.month3,   a.month4,   a.month5,   a.month6,   a.month7,   a.month8,
   a.month9,   a.month10,   a.month11,   a.month12,       
   a.month1 + a.month2 + a.month3 + a.month4 + a.month5 + a.month6 +   a.month7 + a.month8 + a.month9 + +a.month10 + a.month11 + a.month12 AS pl_sum,
   m.[DaysAbsent],m.[DaysPresent]
  FROM p_leave_allocation AS a
   INNER JOIN
   emp_mst AS e
   ON a.emp_card_no = e.emp_card_no
   INNER JOIN
   (
   SELECT 
        comp_mkey,emp_mkey,[month],[year], 
        SUM(CASE WHEN data ='AB' THEN 1 ELSE 0 END) AS [DaysAbsent],
        SUM(CASE WHEN data ='P' THEN 1 ELSE 0 END) AS [DaysPresent]
    FROM
        (
        SELECT comp_mkey,emp_mkey,[month],[year],[Day1],[Day2],[Day3],[Day4],[Day5]
        --,...  
        FROM Emp_mon_day
        ) source
        UNPIVOT
        (
        data FOR day IN ([Day1],[Day2],[Day3],[Day4],[Day5]) -- dynamic query can generate all days data
        )up
        GROUP BY comp_mkey, emp_mkey,[month],[year]
   ) AS m
   ON m.comp_mkey=e.Comp_mkey and m.emp_mkey=e.mkey
   --- ABOVE CRITERIA NEEDS TO BE CHECKED
  WHERE  a.year = 2016
   AND (datediff(MONTH, e.date_of_joining, CONVERT (DATETIME, getdate(), 103)) >= 6
        AND datediff(MONTH, e.date_of_joining, CONVERT (DATETIME, getdate(), 103)) <= 36)
   AND (e.resig_date IS NULL
        OR (e.dt_of_leave IS NOT NULL
            AND e.dt_of_leave >= CONVERT (DATETIME, getdate(), 103)))
   AND e.status IN ('A', 'S')
   AND e.comp_mkey IN (7, 110)
   AND a.Year = 2016;

Uitleg:

We hebben nog een INNER JOIN toegevoegd aan de bestaande zoekopdracht om verzamelde gegevens van DaysPresent te krijgen en DaysAbsent

Om dit verder te optimaliseren, raad ik je aan om direct te solliciteren door WHERE . te volgen clausule naar source instellen

WHERE  comp_mkey IN (7, 110) AND Year = 2016;