group by with (-) operator in oracle query

Question

I have a query like this below. There is ( - ) operator = (AA.SOURCE_CREDIT - BB.SOURCE_DEBIT / 1.1) . I want to group by BR.AREA_ID. Just BR.AREA_ID. But it gave me error:

ORA-00979: not a GROUP BY expression

And I have to add AA.SOURCE_CREDIT and BB.SOURCE_DEBIT in group by. But the result becoming not what I want. Just AREA_ID that I want.

 SELECT   'SALES EU' AS DESCRIPTION,
           (AA.SOURCE_CREDIT - BB.SOURCE_DEBIT / 1.1) AS amount,
           BR.AREA_ID
    FROM            VI_REPORT_BK_PENJUALAN BK
                 JOIN
                    MST_BRANCH BR
                 ON BR.BRANCH_ID = BK.BRANCH_ID
              LEFT OUTER JOIN
                 (SELECT   JH.JOURNAL_NO, JD.SOURCE_CREDIT
                    FROM         TRX_JOURNAL_GL_HEADER JH
                              JOIN
                                 TRX_JOURNAL_GL_DETAIL JD
                              ON JH.JOURNAL_NO = jd.JOURNAL_NO
                           JOIN
                              TRX_DELIVERY_CONFIRMATION DC
                           ON DC.DELIVERY_NO = JH.DOCUMENT_NO
                   WHERE   JD.SOURCE_TYPE = '40100000') AA
              ON (AA.JOURNAL_NO = BK.JOURNAL_NO)
           LEFT OUTER JOIN
              (SELECT   JH.JOURNAL_NO, JD.SOURCE_DEBIT
                 FROM         TRX_JOURNAL_GL_HEADER JH
                           JOIN
                              TRX_JOURNAL_GL_DETAIL JD
                           ON JH.JOURNAL_NO = jd.JOURNAL_NO
                        JOIN
                           TRX_DELIVERY_CONFIRMATION DC
                        ON DC.DELIVERY_NO = JH.DOCUMENT_NO
                WHERE   JD.SOURCE_TYPE = '40502002') BB
           ON (BB.JOURNAL_NO = BK.JOURNAL_NO)
GROUP BY   BR.AREA_ID, AA.SOURCE_CREDIT, BB.SOURCE_DEBIT

I already try to make group by inside the subs-query. But still not work. I'm browsing also in google but I didn't find the case like my case.

Answer 1

tf there are more rows than one to each row, what do you expect the query gives back? Example:

AREA_ID | AA.SOURCE_CREDIT | BB.SOURCE_DEBIT
   1    |      100         |       50
   1    |       70         |       50

It you are sure there is only one row for each area id, so you could use SUM, MAX, AVG or anything else.

SELECT   'SALES EU' AS DESCRIPTION,
           (MAX(AA.SOURCE_CREDIT) - MAX(BB.SOURCE_DEBIT) / 1.1) AS amount,
           BR.AREA_ID
...

If there could be more results you should decide, what Aggregate function fits best.