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学生の得点を五分位にグループ化するのを手伝ってくれる人はいますか? SQL Server 2012 には機能があると思いますが、まだt upgraded to it as we are using 2008R2. I triedNtile(5)` がありますが、目的の結果が生成されていません。五分位列の下が必要です

Student   Score Quintile
------------------------    
Student1     20   1
Student2     20   1
Student3     30   2
Student4     30   2
Student5     40   2
Student6     40   2
Student7     50   3
Student8     50   3
Student9     60   3
Student10    70   4
Student11    70   4
Student12    80   4
Student13    80   4
Student14    90   5
4

3 に答える 3

1

marc_s から拝借 +1 

DECLARE @Students TABLE (StudentID INT IDENTITY(1,1), StudentName VARCHAR(20), Score INT)

INSERT INTO @Students(StudentName, Score)
VALUES ('Student 1', 20), ('Student 2', 20), 
('Student 3', 30), ('Student 4', 30), 
('Student 5', 40), ('Student 6', 40), 
('Student 7', 50), ('Student 8', 50), 
('Student 9', 60), ('Student 10', 70), 
('Student 11', 70),('Student 12', 80), 
('Student 13', 80),('Student 14', 90)

SELECT s.StudentName, s.Score, qm.maxQ
  FROM @Students as s
  join ( select score, MAX(Quintile) as maxQ
           from ( SELECT Score, Quintile = NTILE(5) OVER(ORDER BY Score)
                    FROM  @Students ) q 
          group by q.score ) qm
    on qm.Score = s.Score
于 2014-07-24T09:37:22.730 に答える
0 
Below is the correct answer given by Erland Sommarskog 
Create Table #Scores(Student varchar(20), Score int); 
Insert #Scores(Student, Score) Values 
('Student1', 20) 
,('Student2', 20) 
,('Student3', 30)
,('Student4', 30)
,('Student4', 30)
,('Student4', 30)
,('Student5', 40)
,('Student6', 40)
,('Student7', 50)
,('Student8', 50)
,('Student9', 60)
,('Student10', 70)
,('Student11', 70) 
,('Student12', 80) 
,('Student13', 80) 
,('Student14', 90); 

; WITH quintiles AS (
    SELECT Score, ntile(5) OVER(ORDER BY Score) AS quintile 
    FROM   (SELECT DISTINCT Score FROM #Scores) AS s 
)
SELECT s.Student, s.Score, q.quintile
FROM   #Scores s
JOIN   quintiles q ON s.Score = q.Score
go
DROP TABLE #Scores

--by Erland Sommarskog``
于 2014-08-13T10:50:36.520 に答える