SQL Server 2012：加权平均计算

问题描述：

我试图计算表中某些数据的加权平均成熟度。SQL Server 2012：加权平均计算

SaleEventID LID(PK) CurrentUPB   Interest Rate RemainingMonths 
1   1   $100,000.00   6.100%   11.00 
1   2   $67,000.00   6.200%   360.00 
1   3   $1,400,000.00  6.300%   240.00 
1   4   $500,000.00   7.000%   100.00 
2   5   $1,400,000.00  7.100%   240.00 
2   6   $500,000.00   7.000%   100.00

所以我试图完成的公式是（WAM）：
1）乘CurrentUPB *为LID RemainingMonths = 1
2）做到这一点对每个匹配行WHERE SaleEventID = 1
3）SUM上述计算= $411,220,000.00 = A
4）SUM所有CurrentUPB WHERE SaleEventID = 1，这等于$2,067,000.00 = B
5）然后除以A/B = $198.95这是我的WAM

我需要考虑的是，在我的表，我将有很多贷款和每个不会被归于同一个SaleEventID值（是不是主键）

我的查询到目前为止：

SELECT l.*, A/B FROM AS WAM 
FROM (SELECT LSX_DC_Loans l 
     (SELECT CurrentUPB * RemainingMonths FROM l WHERE LID = 1 
     ) AS A 
     (SELECT SUM (CurrentUPB) CurrentUPB FROM LSX_DC_Loans 
     WHERE SaleEventID = 1 
     ) AS B 
FROM l 
) l

我很难找出如何做步骤2 & 4.任何帮助，例子高度赞赏。

什么是洛纳？ – DVT

刚刚更新了错过输入网格中的信息的问题。 – UserSN

$ 411,220,000/$ 3,967,000 = $ 103.6602健康198.95从何而来？ – xQbert

答

要计算WAM和WAIR是非常简单的。想想SUMPRODUCT（）在Excel

Declare @YourTable table (SaleEventID int,LID int,CurrentUPB money,[Interest Rate] money,RemainingMonths money) 
Insert Into @YourTable values 
(1,1,100000.00,6.100, 11.00), 
(1,2,67000.00,6.200, 360.00), 
(1,3,1400000.00,6.300, 240.00), 
(1,4,500000.00,7.000, 100.00), 
(2,5,1400000.00,7.100, 240.00), 
(2,6,500000.00,7.000,100.00) 


Select SaleEventID 
     ,UPB = sum(CurrentUPB) 
     ,WAM = sum(CurrentUPB*RemainingMonths)/sum(CurrentUPB) 
     ,WAIR = sum(CurrentUPB*[Interest Rate])/sum(CurrentUPB) 
From @YourTable 
Where SaleEventID = @Event 
Group By SaleEventID

SaleEventID UPB   WAM   WAIR 
1   2067000.00 198.9453 6.4564 
2   1900000.00 203.1578 7.0736

哇。你是专业人士。 – DVT

太棒了！谢谢John – UserSN

@DVT Nope。刚刚在银行业度过了几十年:) –

答

如果我正确理解你的问题，这里就是答案

SELECT 
    l.* 
    , l1.A/l2.B AS WAM 
FROM 
    LXC_DC_Loans l 
    CROSS APPLY (SELECT SUM(CurrentUPB * RemainingMonths) AS A FROM LSX_DC_Loans WHERE SaleEventID=l.SaleEventID) l1 
    CROSS APPLY (SELECT SUM(CurrentUPB) AS B A FROM LSX_DC_Loans WHERE SaleEventID=l.SaleEventID) l2

SQL Server 2012：加权平均计算

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