Wrong output by query in ms sql server - sql

Question

I have written a query in ms sql server in which I am using pivoting. As I am not familiar with pivoting I want to know where I am going wrong, as my query is not producing the desired output. My query is like this:
SELECT Name,ap,er,ft,vp
FROM (SELECT DISTINCT tbStudent.Name,
dbo.tbSubjects.SubCode,
dbo.fnTotalDays(dbo.tbAttendanceMaster.SubID,
dbo.tbStudent.StudentID) AS Total
FROM dbo.tbAttendance
INNER JOIN dbo.tbAttendanceMaster
ON dbo.tbAttendance.MasterAID = dbo.tbAttendanceMaster.AtdID
INNER JOIN dbo.tbStudent
ON dbo.tbAttendance.StID = dbo.tbStudent.StudentID
INNER JOIN dbo.tbSubjects
ON dbo.tbAttendanceMaster.SubID = dbo.tbSubjects.SubID
LEFT OUTER JOIN dbo.tbSemester
ON dbo.tbSubjects.SemID = dbo.tbSemester.SemID) sq
PIVOT(sum(Total) FOR SubCode IN(ap,er,ft,vp) ) AS pt
UNION ALL
SELECT Name ,ap ,er ,ft ,vp
FROM (SELECT DISTINCT tbStudent.Name,
dbo.tbSubjects.SubCode,
dbo.fnNoOfDays(dbo.tbAttendanceMaster.SubID,
dbo.tbStudent.StudentID) AS Present
FROM dbo.tbAttendance
INNER JOIN dbo.tbAttendanceMaster
ON dbo.tbAttendance.MasterAID = dbo.tbAttendanceMaster.AtdID
INNER JOIN dbo.tbStudent
ON dbo.tbAttendance.StID = dbo.tbStudent.StudentID
INNER JOIN dbo.tbSubjects
ON dbo.tbAttendanceMaster.SubID = dbo.tbSubjects.SubID
LEFT OUTER JOIN dbo.tbSemester
ON dbo.tbSubjects.SemID = dbo.tbSemester.SemID ) sq2
PIVOT(sum(Present) FOR SubCode IN(ap,er,ft,vp) ) AS pt2
It is giving me output like this:
Name Ep ER FT SQ
Amir 2 9 3 2
muzamil NULL 5 NULL
roof 2 9 3 7
Amir 0 9 3 1
muzamil NULL 5 NULL
roof 2 7 3 7
but I want output like this:
Name Ep ER FT SQ JB CQ LQ YC
Amir 2 9 3 2 0 9 3 1
muzamil NULL 5 NULL NULL 5 NULL NULL
roof 2 9 3 7 2 7 3 7
I want the last three rows which are the output of second query to show as the new columns JB, CQ, LQ and YC on the original three rows as shown in my table above.

Answer 1

There seem to be some mismatches in the column names in your query, you use SELECT Name,ap,er,ft,vp but the sample output lists Name Ep ER FT SQ, so you might have to adjust the answer below to fit your needs.
I think this query might work:
SELECT
Name,
MAX(ap) AS EP, MAX(er) AS ER,
MAX(ft) AS FT, MAX(vp) AS SQ,
MAX(jb) AS JB, MAX(cq) AS CQ,
MAX(lq) AS LQ, MAX(yc) AS YC
FROM (
SELECT
Name,
ap, er, ft, vp,
NULL AS JB, NULL AS CQ, NULL AS LQ, NULL AS YC
FROM (
SELECT DISTINCT
tbStudent.Name,
dbo.tbSubjects.SubCode,
dbo.fnTotalDays(dbo.tbAttendanceMaster.SubID,
dbo.tbStudent.StudentID) AS Total
FROM dbo.tbAttendance
INNER JOIN dbo.tbAttendanceMaster
ON dbo.tbAttendance.MasterAID = dbo.tbAttendanceMaster.AtdID
INNER JOIN dbo.tbStudent
ON dbo.tbAttendance.StID = dbo.tbStudent.StudentID
INNER JOIN dbo.tbSubjects
ON dbo.tbAttendanceMaster.SubID = dbo.tbSubjects.SubID
LEFT OUTER JOIN dbo.tbSemester
ON dbo.tbSubjects.SemID = dbo.tbSemester.SemID
) sq
PIVOT(SUM(Total) FOR SubCode IN (ap,er,ft,vp)
) AS pt
UNION ALL
SELECT
Name,
NULL AS ap, NULL AS er, NULL AS ft, NULL AS vp,
ap AS JB, er AS CQ, ft AS LQ, vp AS YC
FROM (
SELECT DISTINCT tbStudent.Name,
dbo.tbSubjects.SubCode,
dbo.fnNoOfDays(dbo.tbAttendanceMaster.SubID,
dbo.tbStudent.StudentID) AS Present
FROM dbo.tbAttendance
INNER JOIN dbo.tbAttendanceMaster
ON dbo.tbAttendance.MasterAID = dbo.tbAttendanceMaster.AtdID
INNER JOIN dbo.tbStudent
ON dbo.tbAttendance.StID = dbo.tbStudent.StudentID
INNER JOIN dbo.tbSubjects
ON dbo.tbAttendanceMaster.SubID = dbo.tbSubjects.SubID
LEFT OUTER JOIN dbo.tbSemester
ON dbo.tbSubjects.SemID = dbo.tbSemester.SemID
) sq2
PIVOT(SUM(Present) FOR SubCode IN (ap,er,ft,vp)
) AS pt2
) AS subquery GROUP BY Name