Not able to perform Query Grouping - sql

Question

i want to rotate my table horizontally -
The tables are as follows:
Master_Choicecode
ChoiceCode MainCourseId CourseLevelId InstituteId
Master_MainCourse
MainCourseId MainCourseName CourseLevelId CourseProgram
11 x 1 abc
12 y 2 xyz
Master_CourseLevel
CourseLevelId CourseLevelName
1 deg
2 Dip
Master_Institute
Instituteid InstituteName Statusid
1001 Insti1 100
1002 Insti2 200
Master_InstituteStatus
StatusId StatusName
100 Status1
200 Status2
Now using all these tables i want to show this:
CourseProgram CourseLevelName Status1(from Master_InstituteStatus) Status2(from Master_InstituteStatus)
abc Deg Count of institutes belonging to status1 Count of institutes belonging to status2
Now this is what i have tried:
SELECT B.CourseProgram,C.CourseLevelName,
case when E.InstituteStatusName =' Status1' then COUNT(*) else null end as Status1,
case when E.InstituteStatusName =' Status2' then COUNT(*) else null end as Status2,
FROM Master_ChoiceCode A
inner join Master_MainCourse B on A.MainCourseID=B.MainCourseID
inner join Master_CourseLevel C on A.CourseLevelID=C.CourseLevelID
inner join Master_Institute D on A.InstituteID=D.InstituteID
inner join Master_InstituteStatus1 E on D.InstituteStatusID1=E.InstituteStatusID
where B.CourseLevelID IN(1,2)
GROUP BY B.CourseProgram,A.CourseLevelID,C.CourseLevelName,E.InstituteStatusName
order by B.CourseProgram,C.CourseLevelName;
But with this i get the output like this:
CourseProgram CourseLevelName Status1(from Master_InstituteStatus) Status2(from Master_InstituteStatus)
abc Deg Count of institutes belonging to status1
abc Deg Null Count of institutes belonging to status1
i got the solution to this is to use pivot...but i dont knw how shal i use Pivot with my current query.Please help me..

Answer 1

You're close, but grouping on E.InstituteStatusName means you will not be able to combine the data onto one row. Rather than use the case statement with a count, you could use a conditional sum.
SELECT B.CourseProgram,C.CourseLevelName,
sum(case when E.InstituteStatusName =' Status1' then 1 else 0 end) as Status1,
sum(case when E.InstituteStatusName =' Status2' then 1 else 0 end) as Status2,
FROM Master_ChoiceCode A
inner join Master_MainCourse B on A.MainCourseID=B.MainCourseID
inner join Master_CourseLevel C on A.CourseLevelID=C.CourseLevelID
inner join Master_Institute D on A.InstituteID=D.InstituteID
inner join Master_InstituteStatus1 E on D.InstituteStatusID1=E.InstituteStatusID
where B.CourseLevelID IN(1,2)
GROUP BY B.CourseProgram,A.CourseLevelID,C.CourseLevelName
order by B.CourseProgram,C.CourseLevelName;
This will effectively count the rows matching that status without the need for grouping on that field.

Answer 2

You could use the built in PIVOT function in SQL-Server:
WITH CTE AS
( SELECT B.CourseProgram,
C.CourseLevelName,
E.InstituteStatusName,
b.CourseLevelID
FROM Master_ChoiceCode A
INNER JOIN Master_MainCourse B
ON A.MainCourseID=B.MainCourseID
INNER JOIN Master_CourseLevel C
ON A.CourseLevelID=C.CourseLevelID
INNER JOIN Master_Institute D
ON A.InstituteID=D.InstituteID
INNER JOIN Master_InstituteStatus1 E
ON D.InstituteStatusID1=E.InstituteStatusID
WHERE B.CourseLevelID IN (1,2)
)
SELECT CourseProgram, CourseLevelName, [Status1], [Status2]
FROM CTE
PIVOT
( COUNT(CourseLevelID)
FOR InstituteStatusName IN ([Status1], [Status2])
) pvt
ORDER BY CourseProgram, CourseLevelName;