SQL Server根据不同的标志计算累积和/条件运行总计

Question

我在SQL Server中有一个表,数据看起来像这个例子.

ID  Flag    Art.No  Amount
1   U   A1000   -100
2   U   B2000   -5
3   V   B2000   900
4   U   B2000   -10
5   I   B2000   50
6   U   B2000   -20
7   U   A1000   -50
8   I   A1000   1000
9   V   A1000   3600
10  U   A1000   -500
11  U   A1000   -100
12  U   A1000   -2000
13  I   A1000   2000
14  U   A1000   -1000
15  I   C3000   10000
16  U   C3000   -4000
17  U   B2000   -5
18  U   B2000   -5
19  I   B2000   40
20  V   B2000   200
21  U   A1000   -500
22  U   B2000   -50
23  U   C3000   -1000

我想根据交易计算累计值.我的问题是该表包含3种类型的事务.

1. 旗帜U - 销售
2. 旗帜I - 收货
3. 国旗V - Stocktaking

当标志U和I出现时,金额代表变化当标志V出现时,金额代表盘点时的总金额

在单词中,我想为每个unice Art.No找到最新的V-transaction,然后添加或减去U和I事务以获得每行的累积量.如果没有V事务,则遍历整个数据集.

我已经为每个Art.No做了预期结果的例子

A1000

ID  Flag    Art.No  Amount  A1000 Example
1   U   A1000   -100    
7   U   A1000   -50 
8   I   A1000   1000    
9   V   A1000   3600    3600
10  U   A1000   -500    3100
11  U   A1000   -100    3000
12  U   A1000   -2000   1000
13  I   A1000   2000    3000
14  U   A1000   -1000   2000
21  U   A1000   -500    1500

B2000

ID  Flag    Art.No  Amount  B2000 Example
2   U   B2000   -5  
3   V   B2000   900 
4   U   B2000   -10 
5   I   B2000   50  
6   U   B2000   -20 
17  U   B2000   -5  
18  U   B2000   -5  
19  I   B2000   40  
20  V   B2000   200 200
22  U   B2000   -50 150

C3000

ID  Flag    Art.No  Amount  C3000 Example
15  I   C3000   10000   10000
16  U   C3000   -4000   6000
23  U   C3000   -1000   5000

编辑:要在数据集中获得更多历史记录,最好在最新的V-transaction之前获得值

B2000

ID  Flag    Art.No  Amount  B2000 Example
2   U   B2000   -5  150
3   V   B2000   900 140
4   U   B2000   -10 140
5   I   B2000   50  190
6   U   B2000   -20 170
17  U   B2000   -5  165
18  U   B2000   -5  160
19  I   B2000   40  200
20  V   B2000   200 200
22  U   B2000   -50 150

考虑每个I和U事务但忽略V事务.

Answer 1

with cte as
 (
   select *,
      -- find the latest 'V' ID per ArtNo
      max(case when Flag = 'V' then ID end) 
      over (partition by ArtNo) as Last_V_ID
   from myTable
 )
select *,
   -- cumulative sum, but ignore all rows before the latest 'V' ID
   -- includes rows when there's no 'V' ID for this ArtNo
   sum(case when ID < Last_V_ID then null else Amount end)
   over (partition by ArtNo
         order by ID
         rows unbounded preceding)
from cte
order by ArtNo, ID

见小提琴

编辑：

要包含上次盘点之前的数据并忽略所有之前的盘点，您可以使用以下方法：

with cte as
 (
   select *,
      -- find the latest 'V' ID per ArtNo
      max(case when Flag = 'V' then ID end) 
      over (partition by ArtNo) as Last_V_ID
   from [dbo].[Warehouse]
 )
select *,
   -- cumulative sum, but ignore all rows before the latest 'V' ID
   -- includes rows when there's no 'V' ID for this ArtNo
   sum(case when ID < Last_V_ID then null else Amount end)
   over (partition by ArtNo
         order by ID
         rows unbounded preceding)
   -- calculate in-stock based on last 'V' ID, discarding all previous 'V' rows
  ,sum(case when (ID < Last_V_ID and Flag <> 'V')  then -Amount 
            when ID = Last_V_ID then Amount 
       end)
   over (partition by ArtNo
         order by ID 
         rows between 1 following and unbounded following)
from cte
order by ArtNo, ID

两种计算都是互斥的，因此您可以使用 COALESCE 轻松组合它们。

见小提琴