SQL服務器：對齊數據透視錶行

Question

我的影片由以下定義的兩個表：

CREATE TABLE Portfolio.DailyStats 
(Date date NOT NULL, 
NAV int NOT NULL, 
SP500 decimal(8,4) NULL, 
R2K decimal(8,4) NULL, 
NetExp decimal(8,4) NULL, 
GrossExp decimal(8,4) NULL,) 
GO 

CREATE TABLE Portfolio.DailyPortfolio 
(BbgID varchar(30) NOT NULL, 
Ticker varchar(22) NULL, 
Cusip char(9) NULL, 
SecurityDescription varchar(50) NOT NULL, 
AssetCategory varchar(25) NOT NULL, 
LSPosition char(3) NULL, 
Ccy varchar(25) NOT NULL, 
Quantity int NULL, 
AvgCost decimal(7,3) NULL, 
PriceLocal decimal(7,3) NULL, 
Cost int NULL, 
MktValNet int NULL, 
GLPeriod int NULL, 
Beta decimal(4,2) NULL, 
BetaExpNet int NULL, 
BetaExpGross int NULL, 
Delta decimal(4,2) NULL, 
DeltaExpNet int NULL, 
DeltaExpGross int NULL, 
Issuer varchar(48) NOT NULL, 
Country varchar(30) NOT NULL, 
Region varchar(20) NOT NULL, 
Sector varchar(30) NOT NULL, 
Industry varchar(48) NOT NULL, 
MktCapCategory varchar(24) NULL, 
MktCapEnd int NULL, 
Date date NOT NULL, 
PortfolioID AS BbgID+LSPosition+ Convert(varchar(8),Date,112) Persisted 
Primary Key) 
GO 

我試圖創造一個我可以看看PNL貢獻爲每間發行機構按年，其中每年表示由一列組成。 PNL貢獻定義爲該年度每年/ AVG（NAV）的SUM（GLPeriod）。舉個例子，我的最終輸出應該是這樣的：

Issuer| 2015| 2016| 2017| 
:-----|-----|-------|-------| 
Issuer A| -0.012550646| -0.| NULL| 
Issuer B| -0.00701487| -0.000759621| -0.004905285| 
Issuer C| NULL| -0.002270388| -0.003730801| 

而是通過電流輸出是這樣的：

Issuer| 2015| 2016| 2017| 
:-----|-----|-------|-------| 
Issuer A| NULL| -0.| NULL| 
Issuer A| -0.012550646| NULL| NULL| 
Issuer B| NULL| NULL| -0.004905285| 
Issuer B| NULL| -0.000759621| NULL| 
Issuer B| -0.00701487| NULL| NULL| 
Issuer C| NULL| NULL| -0.003730801| 
Issuer C| NULL| -0.002270388| NULL| 

在這裏，我使用的代碼：

CREATE VIEW Portfolio.ContributionByYear 
AS 
WITH a 
AS 
(
SELECT Issuer, SUM(GLPeriod) PNL, DATEPART(yyyy, Date) Year 
FROM Portfolio.DailyPortfolio 
GROUP BY Issuer, DATEPART(yyyy, Date) 
) 
, 
b AS 
(
SELECT AVG(CAST(NAV AS BIGINT)) AvgNAV, DATEPART(yyyy, Date) Year 
FROM Portfolio.DailyStats 
GROUP BY DATEPART(yyyy, Date) 
), 
c AS 
(
SELECT a.Issuer, a.PNL, a.Year, b.AvgNAV , CONVERT(decimal (15,3), 
a.PNL)/CONVERT(decimal (15,3), b.AvgNAV) [Contrib] 
FROM a 
JOIN b 
ON a.Year = b.Year 
) 
SELECT Issuer, [2015],[2016],[2017] 
FROM c 
PIVOT 
(
SUM(c.Contrib) 
FOR [Year] IN ([2015],[2016],[2017]) 
) AS PivotTable 
GO 

另一個問題我有這個代碼是我在數據透視表中使用SUM聚合函數，但實際上並沒有添加任何東西。它只是將數據從行移動到列。但是，我似乎無法在不使用某種聚合函數的情況下調整數據。

Answer 1

嘗試從c CTE去除a.PNL和b.AvgNAV ..

SELECT a.Issuer, a.Year, --here `a.PNL` and `b.AvgNAV` is removed 
     CONVERT(decimal (15,3), a.PNL)/CONVERT(decimal (15,3), b.AvgNAV) [Contrib] 
FROM a 
JOIN b 
ON a.Year = b.Year 

開始到Cte's給予適當的名稱，它使代碼更易讀

CREATE VIEW Portfolio.ContributionByYear 
AS 
WITH cteDailyPortfolio 
AS 
(
SELECT Issuer, SUM(GLPeriod) PNL, DATEPART(yyyy, Date) Year 
FROM Portfolio.DailyPortfolio 
GROUP BY Issuer, DATEPART(yyyy, Date) 
), 
cteDailyStats AS 
(
SELECT AVG(CAST(NAV AS BIGINT)) AvgNAV, DATEPART(yyyy, Date) Year 
FROM Portfolio.DailyStats 
GROUP BY DATEPART(yyyy, Date) 
), 
pivotData AS 
(
SELECT a.Issuer, a.Year, --here `a.PNL` and `b.AvgNAV` is removed 
     CONVERT(decimal (15,3), a.PNL)/CONVERT(decimal (15,3), b.AvgNAV) [Contrib] 
FROM cteDailyPortfolio a 
JOIN cteDailyStats b 
ON a.Year = b.Year 
) 
SELECT Issuer, [2015],[2016],[2017] 
FROM pivotData 
PIVOT 
(
SUM(c.Contrib) 
FOR [Year] IN ([2015],[2016],[2017]) 
) AS PivotTable 
GO