SQL query for commulative GPA calculation


hi friends,

i have table following creation sql script

createtable [dbo].[test_enrollment](

      [enrollment_id] [int] notnull,

      [course_offering_id] [int] notnull,

      [student_id] [int] notnull,

      [dept_id] [int] notnull,

      [course_code] [varchar](10)notnull,

      [credit] [int] null,

      [section_id] [int] notnull,

      [semester] [varchar](10)notnull,

      [acad_level] [varchar](30)notnull,

      [acad_year] [varchar](50)notnull,

      [date_enrolled] [date] null,

      [status] [varchar](30)null,

      [total_mark] [decimal](5, 2)null,

      [grade_letter] [varchar](2)null,

      [qpe] [float] null,

      [honor] [float] null,

      [instructor_id] [int] null,

      [username] [varchar](50)null

)on [primary]

go

 

below sql insert above table’s data

insertinto test_enrollment(enrollment_id,course_offering_id,student_id,dept_id,course_code,credit,section_id,

semester,acad_level,acad_year,date_enrolled,[status],total_mark,grade_letter,qpe,honor,instructor_id,username

)values(877,356,104,15,'ird 109',3,395,'one','year 2','2014-2015','2015-10-07','normal',91.00,'a+',4,12,100,'mohamoud')

insertinto test_enrollment(enrollment_id,course_offering_id,student_id,dept_id,course_code,credit,section_id,

semester,acad_level,acad_year,date_enrolled,[status],total_mark,grade_letter,qpe,honor,instructor_id,username

)values(877,356,104,15,'ird 110',3,395,'one','year 2','2014-2015','2015-10-07','normal',87.00,'a',3.7,11.1,100,'mohamoud')

insertinto test_enrollment(enrollment_id,course_offering_id,student_id,dept_id,course_code,credit,section_id,

semester,acad_level,acad_year,date_enrolled,[status],total_mark,grade_letter,qpe,honor,instructor_id,username

)values(877,356,104,15,'ird 111',3,395,'one','year 2','2014-2015','2015-10-07','normal',59.00,'d+',1,3,100,'mohamoud')

insertinto test_enrollment(enrollment_id,course_offering_id,student_id,dept_id,course_code,credit,section_id,

semester,acad_level,acad_year,date_enrolled,[status],total_mark,grade_letter,qpe,honor,instructor_id,username

)values(593,322,104,15,'ird 741',3,395,'two','year 2','2014-2015','2015-10-07','normal',74.00,'b-',2.5,7.5,100,'mohamoud')

insertinto test_enrollment(enrollment_id,course_offering_id,student_id,dept_id,course_code,credit,section_id,

semester,acad_level,acad_year,date_enrolled,[status],total_mark,grade_letter,qpe,honor,instructor_id,username

)values(593,324,104,15,'ird 742',3,395,'two','year 2','2014-2015','2015-10-07','normal',65.00,'c+',2,6,100,'mohamoud')

insertinto test_enrollment(enrollment_id,course_offering_id,student_id,dept_id,course_code,credit,section_id,

semester,acad_level,acad_year,date_enrolled,[status],total_mark,grade_letter,qpe,honor,instructor_id,username

)values(878,359,104,15,'ird 745',3,395,'one','year 2','2014-2016','2015-10-07','normal',68.00,'c+',2,6,100,'mohamoud')

insertinto test_enrollment(enrollment_id,course_offering_id,student_id,dept_id,course_code,credit,section_id,

semester,acad_level,acad_year,date_enrolled,[status],total_mark,grade_letter,qpe,honor,instructor_id,username

)values(878,361,104,15,'ird 747',3,395,'one','year 2','2014-2016','2015-10-07','normal',95.00,'a+',4,12,100,'mohamoud')

i trying calculate gpa , commulative gpa (cgpa) student , formula of gpa sum(honor)/sum(credit) , formula of cgpa average of sum(honor)/sum(credit) grouped semester , wrote below query calculating gpa correctly wrongly calculating cgpa. please me correct cgpa shown in below desired result set table.

select x.student_id,avg(x.gpa)as gpa,avg(y.gpa)as'commulative gpa'

from

(

select student_id,sum(honor)/sum(credit) gpa,acad_year,semester from test_enrollment where student_id=104

groupby student_id,acad_year,semester

) x

join

(

select student_id,sum(honor)/sum(credit) gpa,acad_year,semester from test_enrollment where student_id=104

groupby student_id,acad_year,semester

) y on x.acad_year=y.acad_year and x.semester=y.semester groupby x.student_id,x.acad_year,x.semester orderby x.acad_year,x.semester

 

current result set (incorrect commulative gpa)

student_id

gpa

commulative gpa

104

2.9

2.9

104

2.25

2.25

104

3

3

 

desired result set

student_id

gpa

commulative gpa

104

2.9

2.9

104

2.25

2.575

104

3

2.716

 

thanks in advance

best regards,

mohamoud

and here solution older version of sql server:

;with mycte ( 	select  		student_id,sum(honor)/sum(credit) gpa, acad_year, semester,  		row_number() on (partition student_id order acad_year, semester) rn 	from test_enrollment 	where student_id=104 	group student_id,acad_year,semester )  select *, (select avg(gpa) mycte i.rn <= o.rn) mycte o go

 

signature   ronen ariely
 [personal site]    [blog]    [facebook]



SQL Server  >  Getting started with SQL Server



Comments

Post a Comment

Popular posts from this blog

SQL Server PSProvider SQL Server Authentication

greetings: i'm trying use sql psprovider powershell.  can make work management studio by right-clicking next database object.  however, unnable external powershell session. note: i have tried using suggested method msdn ( initializesqlprovider.ps1 , function sqldrive ) i following error: new-psdrive : sql server powershell provider error: not connect 'emtyb06\default+bca_empresarial'. [object ref erence not set instance of object.] @ line:1 char:12 + new-psdrive  <<<< "sqlauth" -psprovider sqlserver -root "sqlserver:\sql\emtyb06\default+bca_empresarial" -credential $cred -scope 1 new-psdrive : sql server powershell provider error: path sqlserver:\sql\emtyb06\default+bca_empresarial not exist.  please specify valid path. @ line:1 char:12 + new-psdrive  <<<< "sqlauth" -psprovider sqlserver -root "sqlserver:\sql\emtyb06\default+bca_empresarial" -cred...
Read more

BIT Version

  hi,     knows how find out ther bit version in sql  , windows os (32 or 64)   regards, s.balavenkatesh   microsoft sql server 2005 - 9.00.1399.06 (intel x86) oct 14 2005 00:33:37 copyright (c) 1988-2005 microsoft corporation standard edition on windows nt 5.2 (build 3790: service pack 2)     intel x86)   -- says sql server 32 bit   madhu SQL Server  >  SQL Server Tools
Read more

How to calculate the delta size while diffing the files in TeamFoundationServer ?

currently, need calculate delta size while diffing files in teamfoundationserver, don't know wheter there are existed tfs api in msdn. far did not find it. familiar it? or deliver suggestions? thanks in advance !! thanks materials !! here solution below: private int calsinglefiledelta(string strbase, string strshelve) { int nfiledelta = 0; arraylist alorgstart = new arraylist(); arraylist aldesstart = new arraylist(); arraylist alunchangedlen = new arraylist(); diffsegment diffseg = difference.difffiles(strbase, encoding.ascii.codepage, strshelve, encoding.ascii.codepage, new diffoptions()); if (diffseg != null) { alorgstart.add(diffseg.originalstart); aldesstart.add(diffseg.modifiedstart); alunchangedlen.add(diffseg.modifiedlength); while (diffseg.next != null) { diffseg = diffseg.next; alorgstart.add(diffseg.originalstart); ...
Read more