Visual studio 2012 获取指定行集之间的平均值

各位，我正在使用Visual Studio 2012构建报告

我希望能够对一组特定行之间的值进行平均

到目前为止，我得到的是这样的东西

=(Count(Fields!SomeField.Value))*.1

及

我想使用这两个值来获得

字段的平均值！SomeField.Value

介于这些值和行数之间。基本上，我删除了顶部和底部10%的数据，并将中间的80%进行平均。也许有更好的办法？谢谢你的帮助

在SQL本身中处理它。 方法1: 使用

NTILE

功能。通过此操作了解有关

NTILE

的更多信息

试试这样的

WITH someCTE AS (
 SELECT SomeField, NTILE(10) OVER (ORDER BY SomeField) as percentile
 FROM someTable)

SELECT AVG(SomeField) as myAverage 
FROM someCTE WHERE percentile BETWEEN 2 and 9

如果你的数据集更大

WITH someCTE AS (
 SELECT SomeField, NTILE(100) OVER (ORDER BY SomeField) as percentile
 FROM someTable)

SELECT AVG(SomeField) as myAverage 
FROM someCTE WHERE percentile BETWEEN 20 and 90

方法2:

SELECT Avg(SomeField) myAvg
From someTable
Where SomeField NOT IN
(
SELECT Top 10 percent someField From someTable order by someField ASC
UNION ALL
SELECT Top 10 percent someField From someTable order by someField DESC
)

注意： 测试边界条件以确保你得到了你需要的。如果需要，调整上面的sql代码

对于NTILE：确保NTILE参数小于（或等于）表中的行数

SELECT Avg(SomeField) myAvg
From someTable
Where SomeField NOT IN
(
SELECT Top 10 percent someField From someTable order by someField ASC
UNION ALL
SELECT Top 10 percent someField From someTable order by someField DESC
)