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CREATE TABLE Student ( StudentID int, Name nvarchar(30), Class nvarchar(30) ); INSERT INTO Student (StudentID, Name, Class) VALUES (1,'Alfredo','X'), (2,'Jack','X'), (3,'Chris','Y'), (4,'Paul','Y'); CREATE TABLE Subject ( SubjectID int, Name nvarchar(30), Class nvarchar(30) ); INSERT INTO Subject (SubjectID, Name, Class) VALUES (1,'Maths','X'), (2, 'Science','X'), (3, 'English','Y'), (4, 'Arts','Y'); CREATE TABLE Performance ( StudentID int, SubjectID int, Marks int ); INSERT INTO Performance (StudentID, SubjectID, Marks) VALUES (1,1,61),(1,2,75), (2,1,82),(2,2,64), (3,3,82),(3,4,83), (4,3,77),(4,4,81);
select * from ( select s.StudentID,name, class , sum(marks) , row_number() over (partition by class order by sum(marks) desc) rn from Performance p join Student s on s.StudentID = p.StudentID group by StudentID ,name,class ) t where rn = 1
StudentID
name
class
sum(marks)
rn
2
Jack
X
146
1
3
Chris
Y
165
1