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T-SQL Query | [ The Average Marks Puzzle ]
Puzzle Statement
- The puzzle is simple.
- You have to list out student information where the student scored more than the Average Marks per subject.
- Please check out the sample input and expected output for details.
Sample Input
| Sname | SMarks | SSubject |
| A | 10 | X |
| B | 20 | X |
| C | 30 | Y |
| D | 40 | Y |
Expected Output
| Sname | SMarks | SSubject |
| B | 20 | X |
| D | 40 | Y |
Rules/Restrictions
- The solution should be should use “SELECT” statement or “CTE”.
- Add your solution(s) in the comments section or send you solution(s) to pawankkmr@gmail.com
Script
Use the below script to generate the source table and fill them up with the sample data.
—
CREATE TABLE Neeraj
(
Sname VARCHAR(1)
,SMarks INT
,SSubject VARCHAR(1)
)
GO
INSERT INTO Neeraj(Sname, SMarks , SSubject) VALUES
('A' , 10 , 'X'),
('B' , 20 , 'X'),
('C' , 30 , 'Y'),
('D', 40 , 'Y')
— |
Update May 10 | Solutions — Pawan Kumar Khowal
-- /************ SOLUTION 1 ****************/ SELECT n.*, Ag FROM Neeraj n INNER JOIN ( SELECT AVG(SMarks) Ag , SSubject FROM Neeraj GROUP BY SSubject ) a on a.SSubject = n.SSubject WHERE SMarks > Ag /************ SOLUTION 2 ****************/ SELECT * FROM Neeraj n WHERE SMarks > ( SELECT AVG(SMarks) ag FROM Neeraj n1 WHERE n1.SSubject = n.SSubject GROUP BY SSubject ) -- |
Add a comment if you have any other solution in mind. We all need to learn.
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;WITH CTE
AS
(
SELECT *,AVG(SMarks)OVER(PARTITION BY SSubject) Ag
FROM #Neeraj
)
SELECT Sname,SMarks,SSubject
FROM CTE
WHERE SMarks>Ag
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