Oracle query to find the maximum of total

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Hi,
I have the below student table with rows like this

C#

student_id  subject_id     Mark
1               1                 60
1               2                 55
1               3                 70
2               1                 80      
2               2                 40
2               3                 50
3               1                 30      
3               2                 40
3               3                 60

I need to find the student_id who has got maximum total marks.Could anyone please help.

Thanks

What I have tried:

I tried with using max(sum) but did not get the correct result.

Posted 25-Oct-16 19:55pm

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Suvendu Shekhar Giri · Answer 1 · 2016-10-25T20:58:00

Solution 1

Something like-

SQL

SELECT MAX(TotalMarks) AS TotalMarks
FROM (
    SELECT student_id,SUM(Mark) AS TotalMarks
    FROM Student
    GROUP BY student_id
) AS TBL

There could be better way to do this but it should gie you the desired result.

Hope, it helps :)

Posted 25-Oct-16 20:58pm

Suvendu Shekhar Giri

Updated 25-Oct-16 21:01pm

v2

Wendelius · Answer 2 · 2016-10-26T09:56:00

This could be done several ways. One quite simple way is to use a query to group and sort the student's based on their marks, for example

SQL

SELECT a.Student_ID, SUM(a.Mark) AS Total
      FROM Student a
      GROUP BY a.Student_ID
      ORDER BY Total DESC

This would give you

STUDENT_ID   TOTAL
----------   -----
1            185
2            170
3            130

Now to pick the first one, you can use the result as an inline view and limit the number of rows to 1. For example

SQL

SELECT *
FROM (SELECT a.Student_ID, SUM(a.Mark) AS Total
      FROM Student a
      GROUP BY a.Student_ID
      ORDER BY Total DESC
     ) b
WHERE RowNum <= 1;