需要中位数跟随 Group By Case

Question

我想知道我是否可以得到一些帮助来计算每个 DonorType 组的中位数运行。通过我得到的查询，它只是对所有值取中值，而不是每个案例分组的值。我已经尝试了一些东西并环顾四周，但我被卡住了。

这是我得到的：

SELECT DonorType = CASE WHEN [Criteria1] THEN 'AutoRecurring'
                    WHEN [Criteria2] THEN 'ManualRecurring'
                    ELSE 'NonRecurring' END,
COUNT(DISTINCT AccountNumber) AS TotalDonors, MIN(TotalDonationAmount) AS MinAmount,
MAX(TotalDonationAmount) AS MaxAmount, AVG(TotalDonationAmount) AS AvgAmount,
((SELECT MAX(TotalDonationAmount) 
    FROM (SELECT TOP 50 PERCENT TotalDonationAmount 
        FROM #TempDonors
     ORDER BY TotalDonationAmount) AS BottomHalf)
+ (SELECT MIN(TotalDonationAmount) 
    FROM (SELECT TOP 50 PERCENT TotalDonationAmount 
        FROM #TempDonors
        ORDER BY TotalDonationAmount DESC) AS TopHalf)) / 2 AS MedAmount
FROM #TempDonors
WHERE TotalDonationAmount > 0
GROUP BY CASE WHEN [Criteria1] THEN 'AutoRecurring'
                WHEN [Criteria2] THEN 'ManualRecurring'
                ELSE 'NonRecurring' END

非常感谢您的帮助。如果有另一个 post 问这个（我确定有，我只是不知道要搜索什么），无论如何只是 post link - 我道歉为我找不到它而提前。

保重！

Answer 1

您需要将中位数计算与外部查询相关联。

看起来像这样：

...
((SELECT MAX(TotalDonationAmount) 
    FROM (SELECT TOP 50 PERCENT TotalDonationAmount 
        FROM #TempDonors t1
        WHERE CASE WHEN t.[Criteria1] THEN 'AutoRecurring'
                WHEN t.[Criteria2] THEN 'ManualRecurring'
                ELSE 'NonRecurring' END=CASE WHEN t1.[Criteria1] THEN 'AutoRecurring'
                WHEN t1.[Criteria2] THEN 'ManualRecurring'
                ELSE 'NonRecurring' END
     ORDER BY TotalDonationAmount) AS BottomHalf)
+ (SELECT MIN(TotalDonationAmount) 
    FROM (SELECT TOP 50 PERCENT TotalDonationAmount 
        FROM #TempDonors t2
        WHERE CASE WHEN t.[Criteria1] THEN 'AutoRecurring'
                WHEN t.[Criteria2] THEN 'ManualRecurring'
                ELSE 'NonRecurring' END=CASE WHEN t2.[Criteria1] THEN 'AutoRecurring'
                WHEN t2.[Criteria2] THEN 'ManualRecurring'
                ELSE 'NonRecurring' END
        ORDER BY TotalDonationAmount DESC) AS TopHalf)) / 2 AS MedAmount
FROM #TempDonors
WHERE TotalDonationAmount > 0
GROUP BY CASE WHEN [Criteria1] THEN 'AutoRecurring'
                WHEN [Criteria2] THEN 'ManualRecurring'
                ELSE 'NonRecurring' END

需要中位数跟随 Group By Case

Need Median to follow Group By Case

sql-server

group-by

case

median