Running Totals with debit credit and previous row SQL Server 2012 - tsql

Question

I am having problems in recalculating the running totals.
I have a situation where we have duplicate transactions and these must be deleted and the and initial and closing balance must be recalculated based on the amount and taking into account when isdebit.
My attempt is to have nested cursors (parent-child) and the parent select all the distinct bookingNo and the child does the calculation looks very messy and I didn't work, didn't post it because I didn't want to confuse things.
I know in SQL Server 2012 you can use (sum over partition by) but I cannot figure how to do it to handle the deleted row etc..
Below is what I did so far
--Create Table for testing
IF object_id(N'TestTransaction', 'U') IS NOT NULL DROP TABLE TestTransaction
GO
CREATE TABLE [TestTransaction]
(
[Id] [bigint] IDENTITY(1,1) NOT NULL,
[BookingNo] [bigint] NOT NULL,
[IsDebit] [bit] NOT NULL,
[Amount] [decimal](18, 2) NOT NULL,
[InitialBalance] [decimal](18, 2) NOT NULL,
[ClosingBalance] [decimal](18, 2) NOT NULL
) ON [PRIMARY]
GO
INSERT [TestTransaction] ([BookingNo], [IsDebit], [Amount], [InitialBalance], [ClosingBalance])
SELECT 200, 0, 100, 2000,2100 UNION ALL
SELECT 200, 0, 100, 2100,2200 UNION ALL
SELECT 200, 1, 150, 2150,2000 UNION ALL
SELECT 200, 0, 300, 2000,2300 UNION ALL
SELECT 200, 0, 400, 2300,2700 UNION ALL
SELECT 200, 0, 250, 2700,2950 UNION ALL
SELECT 200, 0, 250, 2950,3200
--- end of setup
IF OBJECT_ID('tempdb..#tmpTransToDelete') IS NOT NULL DROP TABLE #tmpTransToDelete
GO
CREATE TABLE #tmpTransToDelete
( BoookingNo bigint,
Isdebit bit,
amount decimal(18,2),
InitialBalance decimal(18,2),
ClosingBalance decimal(18,2)
)
DECLARE #RunnnigInitialBalance decimal(18,2),#RunnnigClosingBalance decimal(18,2)
INSERT #tmpTransToDelete(BoookingNo,Isdebit,amount,InitialBalance,ClosingBalance)
SELECT BookingNo,Isdebit,amount,InitialBalance,ClosingBalance
FROM TestTransaction
WHERE ID IN (1,6)
--Delete all duplicate transaction (just to prove the point)
DELETE TestTransaction WHERE ID IN (1,6)
-- now taking into account the deleted rows recalculate the lot and update the table.
Any help? Suggestions?
edited
Results should be
Id BookingNo IsDebit Amount InitialBalance ClosingBalance
2 200 0 100.00 2000.00 2000.00
3 200 1 150.00 2000.00 2150.00
4 200 0 300.00 2150.00 2450.00
5 200 0 400.00 2450.00 2850.00
7 200 0 250.00 2600.00 2850.00

Answer 1

The RunningTotal approach in my previous response would work if there were transactional data that accounted for the initial balance. But, since that evidently isn't the case, I would say you can't delete any rows without also applying the relative difference to all subsequent rows as part of the same transaction. Moreover, I'm convinced your initial sample data is wrong, which only exacerbates the confusion. It seems to me it should be as follows:
SELECT 200, 0, 100, 2000,2100 UNION ALL
SELECT 200, 0, 100, 2100,2200 UNION ALL
SELECT 200, 1, 150, 2200,2050 UNION ALL
SELECT 200, 0, 300, 2050,2350 UNION ALL
SELECT 200, 0, 400, 2350,2750 UNION ALL
SELECT 200, 0, 250, 2750,3000 UNION ALL
SELECT 200, 0, 250, 3000,3250
With that rectified, here's how I'd write the delete-and-update transaction:
BEGIN TRAN
DECLARE #tbd TABLE (
Id bigint
,BookingNo bigint
,Amount decimal(18,2)
);
DELETE FROM TestTransaction
OUTPUT deleted.Id
, deleted.BookingNo
, deleted.Amount * IIF(deleted.IsDebit = 0, 1, -1) AS Amount
INTO #tbd
WHERE ID IN (1,6);
WITH adj
AS (
SELECT tt.BookingNo, tt.Id, SUM(tbd.amount) AS Amount
FROM TestTransaction tt
JOIN #tbd tbd ON tt.BookingNo = tbd.BookingNo AND tbd.id <= tt.id
GROUP BY tt.BookingNo, tt.Id
)
UPDATE tt
SET InitialBalance -= adj.Amount
,ClosingBalance -= adj.Amount
FROM TestTransaction tt
JOIN adj ON tt.BookingNo = adj.BookingNo AND tt.Id = adj.Id;
COMMIT TRAN
Which yields a final result of:
Id BookingNo IsDebit Amount InitialBalance ClosingBalance
2 200 0 100.00 2000.00 2100.00
3 200 1 150.00 2100.00 1950.00
4 200 0 300.00 1950.00 2250.00
5 200 0 400.00 2250.00 2650.00
7 200 0 250.00 2650.00 2900.00

Answer 2

Here's an example of a running total using your data:
SELECT BookingNo
, Amount
, IsDebit
, SUM(Amount * IIF(IsDebit = 0, 1, -1)) OVER (PARTITION BY BookingNo ORDER BY Id ROWS UNBOUNDED PRECEDING) AS RunningTotal
FROM TestTransaction