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How to avoid double count?


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  #1  
Old July 17th, 2012, 10:12 AM
WantToLearn WantToLearn is offline
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How to avoid double count?
I have a query as follow:

Select A.StudentName, A.TotalEnrolled, B.CourseName, B.Location from Students A inner join StudentCourses B on A.StudentId = B.StudentId

and here is the sample result:

StudentName | TotalEnrolled | CourseName | Location
Student A | 2 | Math | 310
Student A | 2 | Science | 210

If I count TotalEnrolled from this result I will get 4, Is there anyway to create a query that returns TotalEnrolled only once for each student. Here is the result that I want:

StudentName | TotalEnrolled | CourseName | Location
Student A | 2 | Math | 310
Student A | 0 | Science | 210

Thanks for your help.
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  #2  
Old July 17th, 2012, 10:33 AM
swampBoogie swampBoogie is offline
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Code:
Select A.StudentName, 
       case when row_number() over(partition by A.StudentName 
                                order by B.CourseName) = 1 then
            A.TotalEnrolled else 0 end as totalEnrolled,
       B.CourseName, 
       B.Location 
  from Students A 
  join StudentCourses B 
    on A.StudentId = B.StudentId
 order
    by A.StudentName,
       B.CourseName
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Old July 17th, 2012, 10:45 AM
WantToLearn WantToLearn is offline
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swampBoogie,
Thanks a lot for the solution.
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