Selecting a specific running total

Question

I am trying to determine the GPA of the top 5 credits that student receives over a given set of terms.
My code...
CREATE TABLE #TEMP
COURSE_ID INT,
STUDENT INT,
TERM CHAR(2),
GRADE_PTS FLOAT,
CREDITS FLOAT
INSERT INTO #TEMP
(COURSE_ID, STUDENT,TERM,GRADE_PTS,CREDITS)
VALUES ('2436801','0441080','FA','86.00000','1.00000'),
('2379009','0441080','FA','82.00000','1.00000'),
('2379005','0441080','SU','41.50000','0.50000'),
('2487620','0441080','SU','41.00000','0.50000'),
('2487621','0441080','FA','40.50000','0.50000'),
('2483446','0441080','SU','40.00000','0.50000'),
('2458013','0441080','FA','40.00000','0.50000'),
('2379002','0441080','SU','40.00000','0.50000'),
('2379004','0441080','FA','39.00000','0.50000'),
('2379016','0551080','SU','38.00000','0.50000'),
('2458089','0551080','SU','37.00000','0.50000'),
('2379091','0551080','FA','86.00000','1.00000'),
('2379075','0551080','SU','43.00000','0.50000'),
('2379047','0551080','FA','76.00000','1.00000')
; with CTE as (
SELECT ROW_NUMBER() OVER(PARTITION BY STUDENT ORDER BY GRADE_PTS DESC) AS RN,
COURSE_ID, STUDENT, TERM,GRADE_PTS,CREDITS
FROM #TEMP A
WHERE TERM IN ('FA', 'SU') AND STUDENT = '0441080'
SELECT A.STUDENT,(SELECT SUM(B.GRADE_PTS) FROM CTE B WHERE B.RN<=A.RN)AS RT_GRADE_PTS,---RUNNING TOTAL FOR STC_CUM_CONTRIB_GRADE_PTS
(SELECT SUM(B.CREDITS) FROM CTE B WHERE B.RN<=A.RN) AS RT_CRED, ---RUNNING TOTAL FOR STC_CMPL_CRED
(SELECT SUM(B.GRADE_PTS) FROM CTE B WHERE B.RN<=A.RN)/(SELECT SUM(B.CREDITS) FROM CTE B WHERE B.RN<=A.RN) AS GPA ---CALCULATION FOR GPA
FROM CTE A
WHERE (SELECT SUM(B.CREDITS) FROM CTE B WHERE B.RN<=A.RN)=5
I would like the script to show 1 record for each STUDENT, GRADE_PTS (total), CREDITS (total) and GPA. The condition is that the calculatioins cannot be more than 5 total credits. Currently, I can only get the script to work for the first student based
on 5 credits but if there are less than 5 (3.5 in the case of student 551080) it should calculate the GPA on the top 3.5 credits.
Suggestions?

Answer 1

CREATE TABLE #TEMP
COURSE_ID INT,
STUDENT INT,
TERM CHAR(2),
GRADE_PTS FLOAT,
CREDITS FLOAT
INSERT INTO #TEMP
(COURSE_ID, STUDENT,TERM,GRADE_PTS,CREDITS)
VALUES ('2436801','0441080','FA','86.00000','1.00000'),
('2379009','0441080','FA','82.00000','1.00000'),
('2379005','0441080','SU','41.50000','0.50000'),
('2487620','0441080','SU','41.00000','0.50000'),
('2487621','0441080','FA','40.50000','0.50000'),
('2483446','0441080','SU','40.00000','0.50000'),
('2458013','0441080','FA','40.00000','0.50000'),
('2379002','0441080','SU','40.00000','0.50000'),
('2379004','0441080','FA','39.00000','0.50000'),
('2379016','0551080','SU','38.00000','0.50000'),
('2458089','0551080','SU','37.00000','0.50000'),
('2379091','0551080','FA','86.00000','1.00000'),
('2379075','0551080','SU','43.00000','0.50000'),
('2379047','0551080','FA','76.00000','1.00000')
--SQL Server 2012 or 2014
;with mycte as (
select *, sum(credits) Over(Partition by STUDENT Order by Grade_PTS DESC, COURSE_ID) runningTotal from #TEMP)
,mycte1 as (
Select * from mycte
WHERE runningTotal<=5
select STUDENT,SUM(GRADE_PTS) Grade_Pts , SUM(GRADE_PTS)/Max(runningTotal) GPA , Max(runningTotal) Credit from mycte1
GROUP BY STUDENT
--Prior SQL Server 2012
;with mycte as (
select STUDENT ,GRADE_PTS, credits, row_number() Over(Partition by STUDENT Order by Grade_PTS DESC, COURSE_ID) rn
from #TEMP
,mycte1 as (
SELECT a.STUDENT, GRADE_PTS, (SELECT SUM( credits) FROM mycte b WHERE b.rn <= a.rn and b.STUDENT=a.STUDENT) as runningTotal
FROM mycte a
Select STUDENT, SUM(GRADE_PTS) Grade_Pts , SUM(GRADE_PTS)/Max(runningTotal) GPA , Max(runningTotal) Credit from mycte1
WHERE runningTotal<=5
GROUP BY STUDENT
drop table #TEMP