根据账户和日期计算另一列中的值加/减或另一个表B（重置总计）的运行总计。
示例
表A - 第一个场景
ID Account Date Operation Qty Running_Total
1 A 01/01/2018 plus 10 10
2 A 01/02/2018 plus 20 30
3 A 01/03/2018 minus 5 20
4 A 01/03/2018 minus 5 20
5 A 01/04/2018 plus 30 50
6 B 01/01/2018 plus 15 15
7 B 01/02/2018 Use Table B 90 40 -- resets
8 B 01/03/2018 plus 10 50
表A - 第二个场景
ID Account Date Operation Qty Running_Total
1 A 01/01/2018 plus 10 10
2 A 01/02/2018 plus 20 30
3 A 01/03/2018 minus 5 20
4 A 01/03/2018 minus 5 20
5 A 01/04/2018 plus 30 50
6 B 01/01/2018 plus 15 15
7 B 01/02/2018 Use Table B 90 40-- resets (currently 80 using below solution)
7 B 01/02/2018 Use Table B 90 40-- resets (currently 80 using below solution)
8 B 01/03/2018 plus 10 50
9 B 01/04/2018 plus 20 75-- new row
10 B 01/04/2018 plus 5 75-- new row
表B
ID Account Date RunningQty
7 B 01/02/2018 40
原始代码：
select ID, Date, Operation, Total,
case when Operation = 'Use Table B' then TableB.RunningTotalQty
else
SUM( case when Operation = 'plus' then Qty
else case when Operation = 'minus' then -Qty end)
OVER (PARTITION BY Account ORDER BY Date) end
From TableA A left Join TableB B
on A.ID = B.ID ...
解决方案应用：（@ UZI＆＃39;代码）
select
ID, Account, Date, Operation, Qty
, Running_Total = sum(isnull(RunningQty, Qty * iif(Operation = 'plus', 1, -1))) over (partition by grp order by ID)
from (
select
a.*, b.RunningQty, grp = sum(isnull(b.RunningQty, 0)) over (order by a.ID)
from
@tableA a
left join @tableB b on a.ID = b.ID and a.Account = b.Account and a.Date = b.Date
) t
答案 0 :(得分：1)
两个运行总计可能会解决您的问题：
declare @tableA table (ID int, Account char(1), Date date, Operation varchar(100), Qty int)
insert into @tableA
values
(1, 'A', '01/01/2018', 'plus', 10)
, (2, 'A', '01/02/2018', 'plus', 20)
, (3, 'A', '01/03/2018', 'minus', 5)
, (4, 'A', '01/03/2018', 'minus', 5)
, (5, 'A', '01/04/2018', 'plus', 30)
, (6, 'B', '01/01/2018', 'plus', 15)
, (7, 'B', '01/02/2018', 'Use Table B', 90)
, (8, 'B', '01/03/2018', 'plus', 10)
declare @tableB table (ID int, Account char(1), Date date, RunningQty int)
insert into @tableB values (7, 'B', '01/02/2018', 40)
select
ID, Account, Date, Operation, Qty
, Running_Total = sum(isnull(RunningQty, Qty * iif(Operation = 'plus', 1, -1))) over (partition by grp order by ID)
from (
select
a.*, b.RunningQty, grp = sum(isnull(b.RunningQty, 0)) over (order by a.ID)
from
@tableA a
left join @tableB b on a.ID = b.ID and a.Account = b.Account and a.Date = b.Date
) t
输出：
ID Account Date Operation Qty Running_Total
-------------------------------------------------
1 A 2018-01-01 plus 10 10
2 A 2018-02-01 plus 20 30
3 A 2018-03-01 minus 5 25
4 A 2018-03-01 minus 5 20
5 A 2018-04-01 plus 30 50
6 B 2018-01-01 plus 15 65
7 B 2018-02-01 Use Table B 90 40
8 B 2018-03-01 plus 10 50
编辑：
你只需要改变第一次运行总计。 sum() over (order by...)默认情况下按范围求和，因此您需要将其更改为按行添加
select
ID, Account, Date, Operation, Qty
, Running_Total = sum(isnull(RunningQty, Qty * iif(Operation = 'plus', 1, -1))) over (partition by grp order by ID)
from (
select
a.*, b.RunningQty, grp = sum(isnull(b.RunningQty, 0)) over (order by a.ID rows unbounded preceding)
from
@tableA a
left join @tableB b on a.ID = b.ID and a.Account = b.Account and a.Date = b.Date
) t