Question

我想知道我是否可以在为每个DonorType组进行中位数计算时获得一些帮助。通过查询，我得到它只是对所有值进行中位数，而不是每个案例分组的值。我尝试了一些东西，环顾四周，但我被卡住了。

以下是我所拥有的：

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

非常感谢你的帮助。如果有另一个帖子问这个（我确定有，我只是不知道要搜索什么），一定只是发布链接 - 我提前道歉我的无能为力找到它。

小心！

Answer 1

您需要将中位数计算与外部查询相关联。

它看起来像这样：

...
((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

需要中位数才能按案例分组

1 个答案: