價值分攤的T-SQL查詢

Question

我有一個需求，我需要在多個記錄中均勻分配一個值。下面是我的數據看起來像

Relationship Table 
------------------------------------------------------- 
CategoryID   SubCategoryID 
------------------------------------------------------- 
101    1 
101    2 
101    3 
102    4 
102    5  

Table 1 
------------------------------------------------------- 
BatchLine ID  CategoryID  Amount 
------------------------------------------------------- 
1     101    10 
2     102    100 
3     101    100 

Table 2 
------------------------------------------------------------------- 
LineID BatchLineID CategoryID SubCategoryID LineValue 
------------------------------------------------------------------- 
1   1    101   1    3.33 
2   1    101   2    3.33 
3   1    101   3    3.33 
4   2    102   4    66.66 
5   2    102   5    33.33 
6   3    101   1    33.33 
7   3    101   2    33.33 
8   3    101   3    33.33  

在「表2」中的「LineValue」是從「表1」上的「金額」字段進行的計算的結果，然後將最終值四捨五入到兩位小數點。在某些情況下，舍入過程會導致與「表格1」中的「金額」字段存在一些差異。

Difference 
------------------------------------------------------------------ 
BatchLineID CategoryID Amount SumofLineValue 
------------------------------------------------------------------ 
1    101   10  9.99 
2    102   100  99.99 
3    101   100  99.99 

爲了從「表1」匹配「金額」值，我們需要與類別ID組中添加「0.01」到每個「LineID」直到的「LineValue」等於它的總和。

還有一個條件，在'CategoryID'101的情況下'表2'中有兩組數據。我們將「0.01」添加到LineID 1，這將使總和與「表1」中的「金額」字段匹配。當我們需要分攤第二組時，需要以「線路ID」7而不是6開始。下面是我預期的數據。

Expected Output 
------------------------------------------------------------------- 
LineID BatchLineID CategoryID SubCategoryID LineValue 
------------------------------------------------------------------- 
1   1    101   1    3.33 + 0.01 
2   1    101   2    3.33 
3   1    101   3    3.33 
4   2    102   4    66.66 + 0.01 
5   2    102   5    33.33 
6   3    101   1    33.33 
7   3    101   2    33.33 + 0.01 
8   3    101   3    33.33 

Answer 1

只要沒有標誌哪些記錄必須更新，該解決方案就會更新每個組的第一條記錄。

with rn as 
(
    select t2.LineID, t1.BatchLineID, t1.CategoryID, t1.Amount, t2.SubCategoryID, 
      sum(t2.LineValue) over (partition by t2.BatchLineID, t2.CategoryID) as ActSum, 
      row_number() over (partition by t2.BatchLineID, t2.CategoryID order by SubCategoryID) as RNum 
    from  t1 
    left join t2 
    on  t1.BatchLineID = t2.BatchLineID 
    and  t1.CategoryID = t2.CategoryID 
) 
update  t2 
set  LineValue = LineValue + (Amount - ActSum) 
from  t2 tt2 
inner join rn 
on   tt2.LineID = rn.LineID 
where  RNum = 1 
and  Amount <> ActSum; 
GO 

select * from t2; 
GO 

 
LineID | BatchLineID | CategoryID | SubCategoryID | LineValue 
-----: | ----------: | ---------: | ------------: | :-------- 
    1 |   1 |  101 |    1 | 3.34  
    2 |   1 |  101 |    2 | 3.33  
    3 |   1 |  101 |    3 | 3.33  
    4 |   2 |  102 |    4 | 66.67  
    5 |   2 |  102 |    5 | 33.33  
    6 |   3 |  101 |    1 | 33.34  
    7 |   3 |  101 |    2 | 33.33  
    8 |   3 |  101 |    3 | 33.33  

dbfiddle here

Answer 2

適應的fiddl從McNets E，你可以使用dense_rank()以確定哪一行應該被更新：

with cte1 as (
    select t2.LineID, t1.BatchLineID, t1.CategoryID, t1.Amount, t2.SubCategoryID, 
      sum(t2.LineValue) over (partition by t2.BatchLineID, t2.CategoryID) as ActSum, 
      row_number() over (partition by t2.BatchLineID, t2.CategoryID order by SubCategoryID) as RNum, 
      dense_rank() over (partition by t1.CategoryID order by t1.BatchLineID) as drank 
    from  t1 
    left join t2 
    on  t1.BatchLineID = t2.BatchLineID 
    and  t1.CategoryID = t2.CategoryID 
) 
select a.LineID, a.BatchLineID, a.CategoryID, a.SubCategoryID, case when drank = rnum then a.LineValue + (b.Amount - b.ActSum) else a.LineValue end as LineValue 
from t2 a 
left join cte1 b 
    on a.LineID = b.LineID 

需要注意的是，你可以運行到隨後的羣體沒有足夠的行，因此沒有行被更新的問題。