T-SQL Server 2012 Teilen einer Gruppenzählung durch die Summe des gruppierten Kontos

Question

Ich versuche, das prozentuale Ergebnis für jede Zeile zu erhalten, wobei die Gruppenzählung für diese Zeile durch die Gesamtsumme aller Zeilen geteilt wird, wie im Beispiel:

so enden I mit der Summe Spalte als Ballon Reihe Prozentsatz der gesamten auf.

SELECT DATEPART(YEAR, Balloons) AS [Year], 
    COUNT(Balloons) AS [Balloons], 
    SUM = (SELECT COUNT(Balloons) 
     FROM TABLE 
     WHERE col2 BETWEEN '20000101' AND '20160101' 
    ) 
FROM TABLE 
WHERE col2 BETWEEN '20000101' AND '20160101' 
GROUP BY DATEPART(YEAR, Balloons) 
ORDER BY COUNT(Balloons) 

Answer 1

SELECT [Year], [Balloons], ROUND(CAST([Balloons] AS REAL)/CAST([SUM] AS real) * 100 ,3) AS [%] FROM (

SELECT  
      DATEPART(YEAR, Balloons) AS [Year] 
      ,COUNT(Balloons) AS [Balloons] 
      ,SUM = (SELECT COUNT(Balloons) FROM TABLE WHERE col2 BETWEEN '20000101' AND '20160101') 

FROM TABLE 

WHERE col2 BETWEEN '20000101' AND '20160101' 

GROUP BY DATEPART(YEAR, Balloons) 

) AS d 
GROUP BY [Balloons], [Year], [SUM] 

ORDER BY [Year] 

Balloons Table:

Results 

    Year Balloons % 
1 2010 2   0.009 
2 2011 1   0.005  
3 2012 1815  8.613 
4 2013 5022  23.831 
5 2014 7742  36.739 
6 2015 6491  30.802