SQL Server查询：调整货币列

我尝试在没有光标的情况下执行以下操作。可能吗

我有一个变量：

DECLARE @Amount MONEY = 800;

我当前拥有的示例表：

EntryID    Amount
--------------------------------------------
1       200
2       250
3       600
4       100
...     ....(could be many more rows)

我希望能够更新该表，以便只显示需要添加到@Amount变量（$800）中的“金额”。所以我希望这张桌子的结尾是这样的：

EntryID    Amount
--------------------------------------------
1       200 (uses up full 200)
2       250 (uses up full 250)
3       350 (uses up 350 of the 600)

还是像这样

EntryID    Amount     Distrib
--------------------------------------------
1       200        200
2       250        250
3       600        350
4       100        0
...     ...            ...

因此，

SUM（）

等于

@Amount

提前谢谢

PS-我在SQL Server 2012中这样做

更新：

这是我的最终解决方案。再次感谢你，戈登：

DECLARE @Amount money = 800;
DECLARE @tmpPaymentDist TABLE (EntryID INT, Amount MONEY, Distrib MONEY);

INSERT INTO @tmpPaymentDist (EntryID, Amount) VALUES (1, 200);
INSERT INTO @tmpPaymentDist (EntryID, Amount) VALUES (2, 250);
INSERT INTO @tmpPaymentDist (EntryID, Amount) VALUES (3, 600);
INSERT INTO @tmpPaymentDist (EntryID, Amount) VALUES (4, 100);

with toupdate as (
    select t.*,
        (case when sum(amount) over (order by entryid) <= @amount
        then amount
        when sum(amount) over (order by entryid) < @amount + amount
        then @amount - (sum(amount) over (order by entryid) - amount)
        else 0
    end) as new_distrib
    from @tmpPaymentDist t
)

update T set distrib = new_distrib 
FROM @tmpPaymentDist T
INNER JOIN toupdate T2 ON T2.EntryID = T.EntryID
WHERE T2.new_distrib > 0

SELECT * FROM @tmpPaymentDist

申报@Amount money=800；
声明@tmpPaymentDist表（EntryID INT、Amount MONEY、Distrib MONEY）；
插入@tmpPaymentDist（EntryID，Amount）值（1200）；
插入@tmpPaymentDist（EntryID，Amount）值（2250）；
插入@tmpPaymentDist（EntryID，Amount）值（3600）；
插入@tmpPaymentDist（EntryID，Amount）值（4100）；
以toupdate作为(
选择t.*，
（金额总和超过（按entryid排序）0时的情况）
从@tmpPaymentDist选择*

是的，您可以在不使用光标的情况下使用累积总和来执行此操作：

select t.*,
       (case when sum(amount) over (order by entryid) <= @amount
             then amount
             when sum(amount) over (order by entryid) < @amount + amount
             then @amount - (sum(amount) over (order by entryid) - amount)
             else 0
        end) as distrib
from table t;

---

成功了！我就知道会有那么疯狂的事情发生！哈哈，谢谢戈登的帮助

with toupdate as (
      select t.*,
             (case when sum(amount) over (order by entryid) <= @amount
                   then amount
                   when sum(amount) over (order by entryid) < @amount + amount
                   then @amount - (sum(amount) over (order by entryid) - amount)
                   else 0
              end) as new_distrib
      from table t
     )
update toudpate
    set distrib = new_distrib;