calculation of balance after each transaction and opening bal - sql-server

Question

I have two SQL Database table namely
Cust_Table(CustID, CustName, custAddrs, CustMob, CustOpBal)
And
Trans_Table(TransId, CustID, TransAmt, TransType(bool dr/cr), Msg, TansDate)
Now I need the SQL Query for getting Statement like (Bank Passbook) for a particular
Customer ID?
Date Message Dt_Amount Cr_Amount Balance
Iam using the following query
SELECT t1.Trans_Date, t1.Trans_Msg,
(CASE WHEN t1.Trans_Type=1 THEN 'Cr' ELSE 'Dr' END) as Trans_Type,
t1.Trans_Amount,
SUM(t2.Trans_Amount*case when t2.trans_type = '1' then 1 else -1 end) as Balance
FROM [LNLCredit].[dbo].[Trans_Table] t1
INNER JOIN [LNLCredit].[dbo].[Trans_Table] t2
ON t1.cust_id = t2.cust_id AND t1.trans_id >= t2.Trans_ID
WHERE t1.Cust_ID=2
GROUP BY t1.cust_id,t1.trans_id,t1.trans_type,t1.Trans_Amount,t1.Trans_Date,t1.Trans_Msg;
Its working fine.
But I also want to add Opening Balance (from Cust_Table) to the above solution.
Please Help??????

Answer 1

Try this..
SELECT t1.Trans_Date, t1.Trans_Msg,
(CASE WHEN t1.Trans_Type=1 THEN 'Cr' ELSE 'Dr' END) as Trans_Type,
t1.Trans_Amount,
SUM(t2.Trans_Amount*case when t2.trans_type = '1' then 1 else -1 end) as Balance,
c.CustOpBal
FROM [LNLCredit].[dbo].[Trans_Table] t1
INNER JOIN [LNLCredit].[dbo].[Trans_Table] t2
ON t1.cust_id = t2.cust_id AND t1.trans_id >= t2.Trans_ID
INNER JOIN Cust_Table C on C.cust_id = t1.cust_id
WHERE t1.Cust_ID=2
GROUP BY t1.cust_id,t1.trans_id,t1.trans_type,t1.Trans_Amount,
t1.Trans_Date,t1.Trans_Msg,C.CustOpBal;
You need to add an extra INNER JOIN and add openingBalance column to GROUP BY and SELECT