Sql 如何保持运行的总计列但按条件停止

我需要满足一些产品的数量。 假设我有100条产品Foo的记录，每条记录的数量在1-100之间。 我刚收到25份Foo的订单

我当然可以把所有的记录都取回来，只取我需要的，但我想知道如何返回足够的记录来满足请求

我相信我已经很接近了，但我无法找出如何限制我达到目标后的记录

declare @neededQty = 10

;WITH Products as 
(
Select 
    p.Name, 
    sp.Price,
    sp.Quantity,
    SUM(sp.Quantity)OVER(PARTITION BY p.Name order by sp.Price, sp.Quantity desc) as QtyRunningTotal
from Product p
    inner join ProductDetails sp on sp.ProductId = p.ProductId
where productId IN (1,2,3,4)
)
select 
* from Products
where QtyRunningTotal >= @neededQty

这是当前输出，但我希望它只返回第一个Foo记录，因为我只需要10个数量

Name    Price   Quantity    QtyRunningTotal
--------------------------------------------
Foo     1       15          15
Foo     1       15          30
Foo     1       15          45
Foo     1       15          60
Foo     1       100         160
Foo     1       100         260
Foo     1       100         360
Bar     1       10          10
Bar     1       10          20
Bar     1       10          30

---

您需要找到运行总数中您想要的数量更多的地方。试试这个：

---

您可以使用这个谓词

where Name = 'Foo' 
      and QtyRunningTotal - Quantity < @neededQty 

---

我计算出，给定数据集，您需要一个范围。我还假设您希望首先收回尽可能少的产品数量，即如果我只需要15个项目，我会收回10和11的记录，而不是100的记录。这里有一个选项：

CREATE TABLE #Product(ProductID int, ProdName varchar(20))
CREATE TABLE #ProductDetails(ProductID int, Price int, Quantity int)

INSERT INTO #Product(ProductID, ProdName) VALUES(1, 'FOO')
INSERT INTO #Product(ProductID, ProdName) VALUES(2, 'BAR')

INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,15)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,16)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,17)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,18)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,100)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,101)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,102)

INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(2,1,10)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(2,1,11)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(2,1,12)

declare @neededQty int = 32

;WITH Products as 
(
Select 
    p.ProdName, 
    sp.Price,
    sp.Quantity,
     LAG(sp.Quantity,1,0) OVER(PARTITION BY p.ProdName order by sp.Price, sp.Quantity  ) LG
from #Product p
    inner join #ProductDetails sp on sp.ProductId = p.ProductId
where p.productId IN (1,2,3,4)
), Prod2 AS
(
select * , 
SUM(LG) OVER(PARTITION BY ProdName ORDER BY Price, LG ) LowRange
,SUM(Quantity) OVER(PARTITION BY ProdName ORDER BY Price, Quantity ) HighRange
from Products)

SELECT * 
FROM Prod2
WHERE LowRange < @neededQty OR  @neededQty >= HighRange 

---

你能只取前1条记录吗？你用的是哪种数据库管理系统？Oracle、MS SQLServer等？最后一个我没有意识到的用例可能是您可以提供帮助。不确定是否应创建新帖子，但如果无法满足数量要求，我不希望返回任何行。然后，您还需要一个附加列，用于总计SUMsp.QuantityOVERPARTITION（按p进行）。名称为QtyTotal并筛选QtyTotal>@needdqtyperfect，再次！

where Name = 'Foo' 
      and QtyRunningTotal - Quantity < @neededQty 

CREATE TABLE #Product(ProductID int, ProdName varchar(20))
CREATE TABLE #ProductDetails(ProductID int, Price int, Quantity int)

INSERT INTO #Product(ProductID, ProdName) VALUES(1, 'FOO')
INSERT INTO #Product(ProductID, ProdName) VALUES(2, 'BAR')

INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,15)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,16)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,17)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,18)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,100)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,101)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(1,1,102)

INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(2,1,10)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(2,1,11)
INSERT INTO #ProductDetails(ProductID,Price,Quantity) VALUES(2,1,12)

declare @neededQty int = 32

;WITH Products as 
(
Select 
    p.ProdName, 
    sp.Price,
    sp.Quantity,
     LAG(sp.Quantity,1,0) OVER(PARTITION BY p.ProdName order by sp.Price, sp.Quantity  ) LG
from #Product p
    inner join #ProductDetails sp on sp.ProductId = p.ProductId
where p.productId IN (1,2,3,4)
), Prod2 AS
(
select * , 
SUM(LG) OVER(PARTITION BY ProdName ORDER BY Price, LG ) LowRange
,SUM(Quantity) OVER(PARTITION BY ProdName ORDER BY Price, Quantity ) HighRange
from Products)

SELECT * 
FROM Prod2
WHERE LowRange < @neededQty OR  @neededQty >= HighRange