使用SQL计算分组平均百分比

Question

我需要最后一列AvgRecordCount为每两列的平均值;看一个例子的第一张图片......

有什么建议吗？

    SELECT l.AltName,
           CASE
                WHEN i.LabelTypeID = 1 THEN 'Generic'
                WHEN i.LabelTypeID = 2 THEN 'Brand'
           END AS LabelType,
           COUNT(i.LabelTypeID) as RecordCount
      FROM [RxTransaction] rxt
INNER JOIN Dimension.Item i 
        ON rxt.DispensedItemID = i.ItemID AND 
           rxt.LocationID = i.LocationID
INNER JOIN Dimension.Location l 
        ON rxt.LocationID = l.LocationId
     WHERE (i.LabelTypeID = 1 OR i.LabelTypeID = 2) AND
           rxt.DateFilled BETWEEN '12/1/2014' AND '12/31/2014'
  GROUP BY i.LabelTypeID, l.AltName

我希望看到此表中的项目结果，请注意两行中的新列百分比平均值，通用/品牌集。

图像显示了SQL和当前结果，我想要一个新的列，每列有2行百分比。

Answer 1

您需要使用您在select语句中使用的确切CASE语句进行分组，例如....

SELECT l.AltName,
       CASE
            WHEN i.LabelTypeID = 1 THEN 'Generic'
            WHEN i.LabelTypeID = 2 THEN 'Brand'
       END AS LabelType,
   COUNT(i.LabelTypeID) as RecordCount
FROM [RxTransaction] rxt
INNER JOIN Dimension.Item i 
        ON rxt.DispensedItemID = i.ItemID AND 
           rxt.LocationID = i.LocationID
INNER JOIN Dimension.Location l 
        ON rxt.LocationID = l.LocationId
     WHERE (i.LabelTypeID = 1 OR i.LabelTypeID = 2) AND
           rxt.DateFilled BETWEEN '12/1/2014' AND '12/31/2014'
GROUP BY l.AltName,
       CASE
            WHEN i.LabelTypeID = 1 THEN 'Generic'
            WHEN i.LabelTypeID = 2 THEN 'Brand'
       END 

Answer 2

我通过为我需要的每个计算字段编写select语句来解决这个问题...见下文。

SELECT L.AltName, L.LocationId, COUNT(A.LabelTypeID) As TotalRecords,

(SELECT COUNT(i.LabelTypeID)
FROM [IntellectRX-DataWarehouse].[Fact].[RxTransaction] rxt
INNER JOIN Dimension.Item i on rxt.DispensedItemID = i.ItemID AND rxt.LocationID = i.LocationID
WHERE  i.LabelTypeID = 1 AND i.LocationID = L.LocationId AND
rxt.DateFilled between '12/1/2014' and '12/31/2014') As GenericTotal,


100
*
(SELECT COUNT(i.LabelTypeID)
FROM [IntellectRX-DataWarehouse].[Fact].[RxTransaction] rxt
INNER JOIN Dimension.Item i on rxt.DispensedItemID = i.ItemID AND rxt.LocationID = i.LocationID
WHERE  i.LabelTypeID = 1 AND i.LocationID = L.LocationId AND
rxt.DateFilled between '12/1/2014' and '12/31/2014')

/

(SELECT COUNT(i.LabelTypeID)
FROM [IntellectRX-DataWarehouse].[Fact].[RxTransaction] rxt
INNER JOIN Dimension.Item i on rxt.DispensedItemID = i.ItemID AND rxt.LocationID = i.LocationID
WHERE  (i.LabelTypeID = 1 OR i.LabelTypeID = 2) AND i.LocationID = L.LocationId AND
rxt.DateFilled between '12/1/2014' and '12/31/2014') As PercentAvg

FROM [IntellectRX-DataWarehouse].[Fact].[RxTransaction] B
INNER JOIN Dimension.Item A on B.DispensedItemID = A.ItemID AND B.LocationID = A.LocationID
INNER JOIN Dimension.Location L on B.LocationID = L.LocationId
WHERE  B.DateFilled between '12/1/2014' and '12/31/2014'
Group by L.AltName, L.LocationId
order by PercentAvg