Sql server 基于上一行和当前行值计算值

我正在计算账户数据，其中的值可以通过当前行值和前一行值获得。 我的问题是我必须到达两列，其中两列都是相互链接的，两列都是通过当前行值和前一行值获取的

我的样本数据

create Table Accounts (SNo int,Groups varchar(10),ToCollect int,Collected int)

insert into Accounts values(1,  'A',    4748,   4650)
insert into Accounts values(2,  'A',    4643,   4582)
insert into Accounts values(3,  'A',    4582,   4482)
insert into Accounts values(4,  'A',    4482,   4415)
insert into Accounts values(5,  'A',    4415,   4330)
insert into Accounts values(6,  'A',    4332,   4241)
insert into Accounts values(7,  'A',    4241,   2246)
insert into Accounts values(8,  'A',    4166,   6000)
insert into Accounts values(9,  'A',    4080,   0)

已尝试的查询：

Select *,case when ToCollect>Collected then Collected Else ToCollect End Adjusted 
    ,case when Collected>ToCollect then Collected-ToCollect Else 0 End Excess into #1
from Accounts

select a.SNo,a.Groups,a.ToCollect,a.Collected
    ,case when a.ToCollect>(a.Collected+b.Excess) then a.Collected+b.Excess Else a.ToCollect End Adjusted 
    ,case when a.Collected+b.Excess>a.ToCollect then a.Collected+b.Adjusted-a.ToCollect Else 0 End Excess
from #1 a left join #1 b on a.SNo=b.SNo-1

实际结果：

SNo Groups  ToCollect   Collected   Adjusted    Excess
1     A       4748        4650         4650       0
2     A       4643        4582         4582       0
3     A       4582        4482         4482       0
4     A       4482        4415         4415       0
5     A       4415        4330         4330       0
6     A       4332        4241         4241       0
7     A       4241        2246         4080       0
8     A       4166        6000         4166      1834
9     A       4080         0           4080        0

预期结果：

 SNo    Groups  ToCollect   Collected   Adjusted    Balance Excess
  1       A       4748        4650        4650        98      0
  2       A       4643        4582        4582        61      0
  3       A       4582        4482        4482        100     0
  4       A       4482        4415        4415        67      0
  5       A       4415        4330        4330        85      0
  6       A       4332        4241        4241        91      0
  7       A       4241        2246        2246        1995    0
  8       A       4166        6000        4166        0       1834
  9       A       4080         0          1834        2246    0

---

这得到了OP想要的结果，但不知道这是否真的是正确答案：

WITH CTE AS(
    SELECT A.SNo,
           A.Groups,
           A.ToCollect,
           A.Collected,
           CASE WHEN A.ToCollect > A.Collected THEN A.Collected ELSE A.ToCollect END AS Adjusted,
           CASE WHEN A.ToCollect > A.Collected THEN A.ToCollect - A.Collected ELSE 0 END AS Balance,
           CASE WHEN A.ToCollect < A.Collected THEN A.Collected - A.ToCollect  ELSE 0 END AS Excess,
           SUM(CASE WHEN A.ToCollect < A.Collected THEN A.Collected - A.ToCollect  ELSE 0 END) OVER (ORDER BY SNo ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING) AS RunningExcess      
    FROM dbo.Accounts A)
SELECT C.SNo,
       C.Groups,
       C.ToCollect,
       C.Collected,
       ISNULL(NULLIF(C.RunningExcess,0),C.Adjusted) AS Adjusted,
       C.Balance - ISNULL(C.RunningExcess,0) AS Balance,
       C.Excess
FROM CTE C;

---

您是否要检查是否有多余的金额，然后将其作为调整后的金额？我不明白-多余的金额是多少，为什么在第8行之前所有行都为0。Sno 9上的调整值、余额和多余值来自何处？除此之外，所有其他的都遵循一种模式。@P.Salmon这是唯一一行Collected>ToCollect@lamu也许余额列应该是短缺？