如何在单个选择查询中获取均值，中位数，众数和范围？

debugcn 发表于 Dev

哥谭·拉莫莫西

我正在尝试获取表中一组值的均值，中位数，众数和范围。我能够得到平均值，但中位数，范围和众数却弄错了。

以下是我为上述概念所尝试的代码。

Select 
    CDS.[Commodity_SourceSeriesID_LongDesc] AS 'Description',
    TD.TimeDimension_Year AS 'Year',
    AVG(DV.DataValues_AttributeValue) AS 'Average/Mean',
    MAX(dv.DataValues_AttributeValue) AS 'Maximum value for the Year',
    MIN(dv.DataValues_AttributeValue) AS 'Minimum value for the Year',
    ((MAX(dv.DataValues_AttributeValue) + MIN(dv.DataValues_AttributeValue)) / 2) AS 'Median',
    --,(SELECT TOP 1 with ties DataValues_AttributeValue
    --FROM   [CoSD].[DataValues] 
    --WHERE  DataValues_AttributeValue IS Not NULL AND DataValues_ERSCommodity_ID = 157 and DataValues_DataRowLifecyclePhaseID = 1
    --GROUP  BY DataValues_AttributeValue
    --ORDER  BY COUNT(*) DESC) AS Mode
    (MAX(dv.DataValues_AttributeValue) - MIN(dv.DataValues_AttributeValue))  AS 'Range'
FROM 
    [CoSD].[DataValues] DV 
INNER JOIN 
    [CoSD].[CommodityDataSeries] CDS ON CDS.Commodity_ID = DV.DataValues_Commodity_ID
INNER JOIN 
    [CoSD].[TimeDimension_LU] TD ON TD.TimeDimension_ID = DV.DataValues_TimeDimension_ID
WHERE 
    DataValues_Commodity_ID = 157  
    AND DataValues_DataRowLifecyclePhaseID IN (1, 4)
GROUP BY 
    DV.DataValues_TimeDimension_ID,
    CDS.Commodity_SourceSeriesID_LongDesc,
    TD.TimeDimension_Year

有没有办法做到这一点？

谢谢

约翰·卡佩莱蒂

不知道这是否会有所帮助，但是这里有一些sql允许我在组中通过以下方式生成一些统计信息（...，均值，中位数，众数，..）。

cteBase将是您的核心数据（未聚合或分组）
cteMedian将生成cteBase的中位数
cteMode将计算cteBase的模式

我只计算出一种度量，但是我怀疑它可以轻松扩展到我有“ GrpByYear”的地方，这将必须扩展到您的复合字段中。

;with cteBase as (
     Select RowNr=Row_Number() over (Partition By Year(TR_Date) Order By Year(TR_Date),TR_Y10)
           ,GrpByYear = Year(TR_Date)
           ,Measure = TR_Y10
     From [Chinrus-Series].[dbo].[DS_Treasury_Rates]
     Where Year(TR_Date)>2014
    )
    ,cteMedian as (Select A.GrpByYear,Measure From cteBase A Join (Select GrpByYear,RowNr=Max(RowNr)/2 from cteBase Group by GrpByYear) B on (A.GrpByYear=B.GrpByYear and A.RowNr=B.RowNr))
    ,cteMode   as (Select * from (Select RowNr=Row_Number() over (Partition By GrpByYear Order by Count(*) Desc),GrpByYear,Measure,Hits=count(*) From cteBase Group by GrpByYear,Measure) A Where RowNr=1)
    Select A.GrpByYear
          ,RecordCount   = Count(*)
          ,DistinctCount = Count(Distinct A.Measure)
          ,SumTotal      = Sum(A.Measure)
          ,Minimum       = Min(A.Measure)
          ,Maximum       = Max(A.Measure)
          ,Mean          = Avg(A.Measure)
          ,Median        = Max(B.Measure)
          ,Mode          = Max(C.Measure)
          ,StdDev        = STDEV(A.Measure)
     From cteBase A
     Join cteMedian B on A.GrpByYear=B.GrpByYear
     Join cteMode   C on A.GrpByYear=C.GrpByYear
     Group By A.GrpByYear
     Order By A.GrpByYear


Year    RecordCount DistinctCount   SumTotal    Minimum Maximum Mean    Median  Mode    StdDev
2016    110         43              204.82      1.63    2.25    1.862   1.84    1.83    0.128568690811108
2015    251         69              536.71      1.68    2.50    2.1382  2.16    2.20    0.1662836533952

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