Query for aggregates for each date in a date range

Question

Hi,
I want to generate a Trend report with a T-SQL proc, which needs following logic. 
Input -
Date Range say '10/10/12' to '20/10/12'  (Say to check the trend of Size of account in 20 days of Trend report)
Account balance is captured randomly, (i mean not every day) 
Table with date looks like this..
--Account Balance Table
CREATE TABLE AccBanalce (
BranchId SMALLINT
NOT NULL,
AccId CHAR(9)
NOT NULL,
Amount DECIMAL(9,3)
NOT NULL,
SnapShotDate DATETIME
NOT NULL 
CONSTRAINT PK_AccBanalce PRIMARY KEY NONCLUSTERED (AccId, SnapShotDate) )
GO
Create CLUSTERED INDEX CIx_AccBanalce ON AccBanalce (SnapShotDate)
GO
--Date Range table
CREATE TABLE DateRange ( StartDate DATETIME, EndDate DATETIME)
GO
--Date for the Account Balance Table
INSERT INTO AccBanalce (BranchId, AccId, Amount, SnapShotDate)
VALUES (1, 'C1-100',  10.4, '10/11/2010' ),
(1, 'G1-110',  20.5, '10/11/2010' ),
(2, 'GC-120',  23.7, '10/11/2010' ),
(2, 'Gk-130',  78.9, '10/13/2010' ),
(3, 'GH-150',  23.5, '10/14/2010'),
(1, 'C1-100',  31.8, '10/16/2010' ),
(1, 'G1-110',  54.8, '10/16/2010' ),
(2, 'GC-120',  99.0, '10/16/2010' ),
(3, 'Gk-130',  110.0, '10/16/2010' ),
(3, 'G5-140',  102.8, '10/16/2010' ),
(2, 'GC-120',  105,  '10/18/2010' ),
(2, 'Gk-130',  56.7, '10/18/2010' ),
(1, 'C1-100',  84.3, '10/18/2010' ),
(1, 'G1-110',  75.2, '10/19/2010' ),
(2, 'GC-120',  64.9, '10/20/2010' ),
(3, 'GH-150',  84.0, '10/20/2010' ),
(1, 'C1-100',  78.0, '10/20/2010' ),
(1, 'G1-110',  89.5, '10/20/2010' )
GO
--Date for DateRange Table
INSERT INTO DateRange (StartDate, EndDate) VALUES
('2010-10-11 00:00:00.000', '2010-10-11 23:59:59.997'),
('2010-10-12 00:00:00.000', '2010-10-12 23:59:59.997'),
('2010-10-13 00:00:00.000', '2010-10-13 23:59:59.997'),
('2010-10-14 00:00:00.000', '2010-10-14 23:59:59.997'),
('2010-10-15 00:00:00.000', '2010-10-15 23:59:59.997'),
('2010-10-16 00:00:00.000', '2010-10-16 23:59:59.997'),
('2010-10-17 00:00:00.000', '2010-10-17 23:59:59.997'),
('2010-10-18 00:00:00.000', '2010-10-18 23:59:59.997'),
('2010-10-19 00:00:00.000', '2010-10-19 23:59:59.997'),
('2010-10-20 00:00:00.000', '2010-10-20 23:59:59.997')
GO
Question - 
I want TOTAL Balance of all Accounts in a Branch per each day between 10/11/2010 to 10/20/2010
If the Snapshotdate (date) on which the account was not made an entery to AccBalance table, last available  balance to be considered for that account.
like for account [C1-100] on 10/15/2010 the balance should be [10.4]
--Group By Branch
--Last valid Account balance to be considered.
I know, this is long solution, but any one who is expert in T-SQL can help me in this solution.
Thanks,
Krishna

Answer 1

Thanks Himanshu You almost solved my issue...but can you provide the final output as following...
Actually you are aggregating the Amount, which is not required, as it is the total available in that account.
But the missing pint is I need the SUM of all the accounts for each DAY in a BRANCH.
The 3rd Result Query modified to get DAILY balances for each account as following...
--*RESULT*
SELECT a.AccId, a.StartDate, 
                    (SELECT TOP 1 b.Amount
                    FROM #InterimOutput b
                    WHERE b.AccId = a.AccId and b.Amount > 0
                    AND B.StartDate<=A.StartDate  ORDER BY B.StartDate DESC) as ToDateBal
FROM   #InterimOutput a
ORDER BY a.AccId
go
Now I need SUM of all Account Balances AT each BRANCH on DAILY basics. Can you help on that?
Thanks again
Krishna