这是一张表......
ID QTY DATE CURRENT_STOCK
----------------------------------
1 1 Jan 30
2 1 Feb 30
3 2 Mar 30
4 6 Apr 30
5 8 May 30
6 21 Jun 30
我需要返回总和数量等于或超过当前库存水平的最新行，一旦达到此总数，就不包括任何其他行，所以我希望只看到这些行......
ID QTY DATE CURRENT_STOCK
----------------------------------
4 6 Apr 30
5 8 May 30
6 21 Jun 30
我假设我需要一个CTE（通用表格表达式），并查看了this question，但无法看到如何将其转换为我的要求。
帮助！？
答案 0 :(得分：3)
Declare @YourTable table (ID int,QTY int,DATE varchar(25), CURRENT_STOCK int)
Insert Into @YourTable values
(1 ,1 ,'Jan' ,30),
(2 ,1 ,'Feb' ,30),
(3 ,2 ,'Mar' ,30),
(4 ,6 ,'Apr' ,30),
(5 ,8 ,'May' ,30),
(6 ,21 ,'Jun' ,30)
Select A.*
From @YourTable A
Where ID>= (
Select LastID=max(ID)
From @YourTable A
Cross Apply (Select RT = sum(Qty) from @YourTable where ID>=A.ID) B
Where B.RT>=CURRENT_STOCK
)
<强>返回
ID QTY DATE CURRENT_STOCK
4 6 Apr 30
5 8 May 30
6 21 Jun 30
答案 1 :(得分：1)
使用提供的数据集执行此操作的一种方法
if object_id('tempdb..#Test') is not null drop table #Test
create table #Test (ID int, QTY int, Date_Month nvarchar(5), CURRENT_STOCK int)
insert into #Test (ID, QTY, Date_Month, CURRENT_STOCK)
values
(1, 1, 'Jan', 30),
(2, 1, 'Feb', 30),
(3, 2, 'Mar', 30),
(4, 6, 'Apr', 30),
(5, 8, 'May', 30),
(6, 21, 'Jun', 30)
if object_id('tempdb..#Finish') is not null drop table #Finish
create table #Finish (ID int, QTY int, Date_Month nvarchar(5), CURRENT_STOCK int)
declare @rows int = (select MAX(ID) from #Test)
declare @stock int = (select MAX(CURRENT_STOCK) from #Test)
declare @i int = 1
declare @Sum int = 0
while @rows > @i
BEGIN
select @Sum = @Sum + QTY from #Test where ID = @rows
IF (@SUM >= @stock)
BEGIN
set @i = @rows + 1 -- to exit loop
END
insert into #Finish (ID, QTY, Date_Month, CURRENT_STOCK)
select ID, QTY, Date_Month, CURRENT_STOCK from #Test where ID = @rows
set @rows = @rows - 1
END
select * from #Finish
答案 2 :(得分：0)
-- Setup test data
CREATE TABLE #Stock
([ID] int, [QTY] int, [DATE] varchar(3), [CURRENT_STOCK] int)
;
INSERT INTO #Stock
([ID], [QTY], [DATE], [CURRENT_STOCK])
VALUES
(1, 1, 'Jan', 30),
(2, 1, 'Feb', 30),
(3, 2, 'Mar', 30),
(4, 6, 'Apr', 30),
(5, 8, 'May', 30),
(6, 21, 'Jun', 30)
;
如果你有一个支持全窗口函数语法的更新版本的SQL服务器，你可以这样做：
-- Calculate a running total of qty by Id descending
;WITH stock AS (
SELECT *
-- This calculates the SUM over a 'window' of rows based on the first
-- row in the result set through the current row, as specified by the
-- ORDER BY clause
,SUM(qty) OVER(ORDER BY Id DESC
ROWS BETWEEN UNBOUNDED PRECEDING
AND CURRENT ROW) AS TotalQty
FROM #Stock
),
-- Identify first row in mininum set that matches or exceeds CURRENT_STOCK
first_in_set AS (
SELECT TOP 1 *
FROM stock
WHERE TotalQty >= CURRENT_STOCK
)
-- Fetch matching set
SELECT *
FROM #stock
WHERE Id >= (SELECT Id FROM first_in_set)
对于只对窗口函数有基本支持的SQL Server 2008，您可以使用CROSS APPLY计算运行总计：
-- Calculate a running total of qty by Id descending
;WITH stock AS (
SELECT *
-- This window function causes the results of this query
-- to be sorted in descending order by Id
,ROW_NUMBER() OVER(ORDER BY Id DESC) AS sort_order
FROM #Stock s1
-- CROSS APPLY 'applies' the query (or UDF) to every row in a result set
-- This CROSS APPLY query produces a 'running total'
CROSS APPLY (
SELECT SUM(Qty) AS TotalQty
FROM #Stock s2
WHERE s2.Id >= s1.id
) total_calc
WHERE TotalQty >= s1.CURRENT_STOCK
),
-- Identify first row in mininum set that matches or exceeds CURRENT_STOCK
first_in_set AS (
SELECT TOP 1 Id
FROM stock
WHERE sort_order = 1
)
-- Fetch matching set
SELECT *
FROM #stock
WHERE Id >= (SELECT Id
FROM first_in_set)
答案 3 :(得分：-1)
你必须解释更多你想做什么。
也许这可以帮到你
从示例中选择*，其中qty＆gt; curr_stock order by id desc limit 3;
///////////////抱歉开头不明白
这是你想要做的也跑进sql server。 http://img.fenixzone.net/i/sOwA13L.png
设置@t：= 0; 选择 id，qty，date_，curr_stock 来自id的示例组具有curr_stock＆gt; =（@t：=（@t + qty））id by id desc;
如果您愿意，可以使用存储的程序
