Sum the balance in history table - sql-server-2008

Question

I need help I'm not able to achieve desired output. I have used cursor as shown below. I have two tables 1. Transaction 2. History. I need to sum the amount in Transaction table for ID and insert it in history table under revised_amount column and also store the amount before sum in Original_amount column. Below is the example. Thanks
Tran_ID ID Amount
1066 Dhan Group $4,800.00
1327 Dhan Group $2,670.00
1329 Dhan Group $1,800.00
1330 Dhan Group $1,290.00
3953 Admin Group 0
2650 Admin Group $364368.69
2651 Admin Group $1604546.97
Desired Output in history table
Hist_ID ID ORIGINAL_AMOUNT REVISED_AMOUNT
1 Dhan Group $4,800.00
2 Dhan Group $4,800.00 $7,470.00
3 Dhan Group $7,470.00 $9,270.00
4 Dhan Group $9,270.00 $10,560.00
5 Admin Group $0
6 Admin Group $0 $364,368.69
7 Admin Group $364,368.89 $1,968,915.86
=============================================================
USE [LEM]
BEGIN
DECLARE #Proj_RID nvarchar(255),
#Revised_Amount decimal(12,2),
#Original_Amount decimal(12,2)
DECLARE Running_Total CURSOR FOR
Select [ID], [Amount]
FROM [Transactions]
OPEN Running_Total;
FETCH NEXT FROM Running_Total into #Proj_RID, #Original_Amount;
WHILE ##FETCH_STATUS = 0
BEGIN
SET #Revised_Amount = #Revised_Amount+ #Original_Amount;
UPDATE HISTORY
SET REVISED_AMOUNT = #Revised_Amount,
Original_Amount = #Revised_Amount - #Original_Amount
WHERE [Project_ID] = #Proj_RID
FETCH NEXT FROM Running_Total into #Proj_RID, #Original_Amount;
END
CLOSE Running_Total;
DEALLOCATE Running_Total;
END
========================================================

Answer 1

Here is an example of how you can achieve this. Note that you need to use some ordering column as TransactionDate:
;WITH cte AS(SELECT *, (SELECT SUM(amount) FROM Transactions
WHERE id = t.ID AND TranDate < t.TranDate) AS ORIGINAL_AMOUNT
FROM Transactions t)
SELECT ID, ORIGINAL_AMOUNT, Amount + ISNULL(ORIGINAL_AMOUNT, 0) AS REVISED_AMOUNT
FROM cte
Here is complete script(but I use transaction ID as ordering column):
DECLARE #t TABLE
(
Tran_ID INT ,
ID NVARCHAR(100) ,
Amount MONEY
)
INSERT INTO #t
VALUES ( 1066, 'Dhan Group', 4800.00 ),
( 1327, 'Dhan Group', 2670.00 ),
( 1329, 'Dhan Group', 1800.00 ),
( 1330, 'Dhan Group', 1290.00 ),
( 2649, 'Admin Group', 0 ),
( 2650, 'Admin Group', 364368.69 ),
( 2651, 'Admin Group', 1604546.97 )
;WITH cte AS(SELECT *, (SELECT SUM(amount) FROM #t
WHERE id = t.ID AND Tran_ID < t.Tran_ID) AS ORIGINAL_AMOUNT
FROM #t t)
SELECT ID, ORIGINAL_AMOUNT, Amount + ISNULL(ORIGINAL_AMOUNT, 0) AS REVISED_AMOUNT
FROM cte
Output:
ID ORIGINAL_AMOUNT REVISED_AMOUNT
Dhan Group NULL 4800.00
Dhan Group 4800.00 7470.00
Dhan Group 7470.00 9270.00
Dhan Group 9270.00 10560.00
Admin Group NULL 0.00
Admin Group 0.00 364368.69
Admin Group 364368.69 1968915.66