problème de requête SQL

Question

J'ai une table SQL appelée StudentMarks.which se composent de StudentID, SubjectName, SubjectMark

Je veux écrire une procédure stockée pour récupérer StudentID, TotalSubjectMarks, MarksAverage, ClassPosition pour chaque student.I doivent trouver le ClassPosition de la MarksAverage. Pour l'étudiant qui a le score le plus élevé, ClassPosition devrait être 1. Les autres devraient obtenir la position 2,3,4 .... Quelqu'un peut-il m'aider avec ceci ???

Merci.

Answer 1

SELECT StudentID, TotalSubjectMark, MarksAverage, 
    ROW_NUMBER() OVER (ORDER BY MarksAverage DESC) ClassPosition 
    FROM (
    SELECT StudentID, 
    SUM(SubjectMark) TotalSubjectMark, 
    AVG(SubjectMark) MarksAverage 
    FROM StudentMarks sm 
    GROUP BY StudentId 
) 

Answer 2

Essayez ceci:

select * , ROW_NUMBER() OVER(ORDER BY avgmarks) AS ClassPosition from 
(
select 
studentid, sum(subjectmark) as total , AVG(subjectmark) as avgmarks 
from studentmarks group by studentid 
) d 

Answer 3

Utilisation d'un serveur sql 2005+ vous pouvez essayer

DECLARE @StudentMarks TABLE(
     StudentID INT, 
     SubjectName VARCHAR(50), 
     SubjectMark FLOAT 
) 

INSERT INTO @StudentMarks SELECT 1, 'A', 80 
INSERT INTO @StudentMarks SELECT 1, 'B', 80 
INSERT INTO @StudentMarks SELECT 1, 'C', 80 
INSERT INTO @StudentMarks SELECT 2, 'A', 60 
INSERT INTO @StudentMarks SELECT 2, 'B', 60 
INSERT INTO @StudentMarks SELECT 2, 'C', 60 


;WITH Marks AS (
     SELECT StudentID, 
       SUM(SubjectMark) TotalSubjectMarks, 
       AVG(SubjectMark) MarksAverage 
     FROM @StudentMarks 
     GROUP BY StudentID 
) 
SELECT *, 
     ROW_NUMBER() OVER(ORDER BY MarksAverage DESC) Position 
FROM Marks