Sum until value reached zero - sql-server-2008

Question

I have two queries.
The result of the first one is the OnHand quantity of the part in the warehouse:
PartNum OnHandQty IUM
100009 19430.00 KG
The result of the second query are transactions related to the receipts of the goods to the warehouse:
TranDate PartNum TranQty UM Dayss
2014-09-01 100009 10720.000 KG 2
2014-09-01 100009 1340.000 KG 2
2014-08-11 100009 8710.000 KG 23
2014-08-11 100009 3350.000 KG 23
2014-06-30 100009 9380.000 KG 65
Now I need to calculate OnHandQy - TranQty until it hits zero, e.g.
19430 - 10720 = 8710 --not enough
8710 - 1340 = 7370 --not enough
7370 - 8710 = -1340 --enough
As a result I need to receive a table like below:
PartNum OnHandQty IUM [0-10 Days] [11-20 Days] [over 21 Days]
100009 19430.00 KG 12060 null 8710
Any ideas how to get this result?

Answer 1

One idea is to use the following query.
WITH(TranDate,PartNum,TranQty,UM,Dayss) trans
AS
(
-- Your second query
)
SELECT F.PartNum
,F.OnHandQty
,F.IUM
,SUM(t0to10.TransQty) AS [0-10 Days]
,SUM(t11to20.TransQty) AS [11-20 Days]
,SUM(tover20.TransQty) AS [over 21 Days]
FROM (Your first query) AS F
JOIN trans AS t0to10 ON F.PartNum = t0to10.PartNum
AND t0to10.Dayss BETWEEN 0 AND 10
JOIN trans AS t11to20 ON F.PartNum = t11to20.PartNum
AND t11to20.Dayss BETWEEN 11 AND 20
JOIN trans AS tover20 ON F.PartNum = tover20.PartNum
AND tover20.Dayss >20
GROUP BY F.PartNum,F.OnHandQty,F.IUM

Answer 2

Declared the OnHandQty and using cursor in a while loop will help to sort this out.

Answer 3

CREATE TABLE #OnHand(
PartNum NVARCHAR(100)
,OnHandQty DECIMAL
,IUM NVARCHAR(5)
)
INSERT INTO #OnHand
(PartNum, OnHandQty, IUM)
VALUES
('100009', 19430.00, 'KG')
CREATE TABLE #Trans(
TranDate DATETIME
,PartNum NVARCHAR(100)
,TranQty DECIMAL
,IUM NVARCHAR(5))
INSERT INTO #Trans
(TranDate, PartNum, TranQty, IUM)
VALUES
('2014-09-01', '100009', 10720.000, 'KG')
,('2014-09-01', '100009', 1340.000, 'KG')
,('2014-08-11', '100009', 8710.000, 'KG')
,('2014-08-11', '100009', 3350.000, 'KG')
,('2014-06-30', '100009', 9380.000, 'KG')
DECLARE #OnHand_Running DECIMAL
,#OnHandQty DECIMAL
,#TranQty DECIMAL
,#TranDate DATETIME
,#PartNum NVARCHAR(100)
,#First10Days INT = 0
,#Second10Days INT = 0
,#Third10Days INT = 0
SET #PartNum = '100009';
Set #OnHandQty = (Select OnHandQty
FROM #OnHand
WHERE PartNum = #PartNum)
Set #OnHand_Running = #OnHandQty
DECLARE tran_cursor CURSOR
FOR SELECT T.TranQty, T.TranDate
FROM #Trans T
ORDER BY T.TranDate DESC
OPEN tran_cursor
FETCH NEXT FROM tran_cursor
INTO #TranQty, #TranDate
WHILE (##FETCH_STATUS = 0) AND (#OnHandQty > 0)
BEGIN
IF (#OnHandQty - #TranQty) < 0
BEGIN
PRINT CAST(#OnHandQty AS NVARCHAR(100)) + '-' + CAST(#TranQty AS NVARCHAR(100)) + '=' + CAST(#OnHandQty - #TranQty AS NVARCHAR(100)) + ' --Enough'
END
ELSE
BEGIN
PRINT CAST(#OnHandQty AS NVARCHAR(100)) + '-' + CAST(#TranQty AS NVARCHAR(100)) + '=' + CAST(#OnHandQty - #TranQty AS NVARCHAR(100)) + ' --Not Enough'
END
IF (DATEDIFF(DAY, #TranDate, CURRENT_TIMESTAMP) < 10)
SET #First10Days = #First10Days + #TranQty
IF (DATEDIFF(DAY, #TranDate, CURRENT_TIMESTAMP) BETWEEN 10 AND 20)
SET #Second10Days = #Second10Days + #TranQty
IF (DATEDIFF(DAY, #TranDate, CURRENT_TIMESTAMP) > 20)
SET #Third10Days = #Third10Days + #TranQty
SET #OnHandQty = #OnHandQty - #TranQty
FETCH NEXT FROM tran_cursor
INTO #TranQty, #TranDate
END
SELECT #PartNum, #OnHand_Running, 'KG', #First10Days '[0-10] Days', #Second10Days '[11-20] Days', #Third10Days '[over 21 days]'
CLOSE tran_cursor;
DEALLOCATE tran_cursor;
RETURN