SQL sum


I have the following three fields with sample data in Oracle database. The data in amount field are all positive. How to make amount to be negative if credit_debit='C' and get the sum of amount field base on tranx_no?

tranx_no   credit_debit            Amount
 001                 C                        80
 001                 D                      100
 001                 C                        20

Thanks in advance.
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slightwv (䄆 Netminder) Commented:
Just use a CASE statement.


select tranx_no, credit_debit, sum(case when credit_debit='C' then amount*-1 else amount end) amount from table_name group by tranx_no, credit_debit;

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