SQL Server SUM of Multiple rows with where and group by

Question

I have a table Transaction that looks something like the following :
TransactionID          
Currency        
Credit             
Debit
1                                USD                   
500               0
2                                Afcu                    
6000             0
3                                INR                     
0                   200
4                                Pfc                      
7000             0
5                                AUD                     
0                  200
6                                INR                     
7000              0
7                                USD                    
1000              0
I write query like this
select SUM(credit)-SUM(Debit)as [Balance] ,Source from Transaction group by Source
and it came like
Balance
Source           
1500                        USD
6000                        Afcu
6800                        INR
7000                        Pfc
-200                         AUD
But I also want to add  Afcu , Pfc with
USD and  want output like
Balance
Source           
14500                        USD
6800                          INR
-200                           AUD
Any Idea?

Answer 1

Here is how you can do it, but you 
DECLARE @TransTable TABLE
(TransactionID INT IDENTITY(1,1),
Currency varchar(10),
Credit DECIMAL,
Debit DECIMAL)
INSERT INTO @TransTable VALUES
('USD',500,0),('Afcu',6000,0),('INR',0,200),('Pfc',7000,0),('AUD',0,200),
('INR',7000,0),('USD',1000,0)
SELECT Currency, SUM(credit)-SUM(Debit)as [Balance]
FROM @TransTable
WHERE Currency NOT IN ('Afcu', 'pfc','USD')
GROUP BY Currency
UNION
SELECT 'USD', SUM(credit)-SUM(Debit)as [Balance]
FROM @TransTable
WHERE Currency IN ('Afcu', 'pfc','USD')
SQL fiddler example
Output:
Hope this will help
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