SQL & PL/SQL

Hi,

Could you tell me how to GROUP BY (ACCOUNT_DESCRIPTION) in below query.

select  DECODE (fah.asset_type, 'NATU', fab.asset_cost_acct,fab.cip_cost_acct)  asset_cost_acct

    --   ,fah.ASSET_ID

       ,(SELECT ffvv.description

   FROM fnd_flex_value_sets ffvs

       ,fnd_flex_values_vl  ffvv

  WHERE ffvs.flex_value_set_id=ffvv.flex_value_set_id

    AND ffvs.flex_value_set_name = 'AP_GL_ACCOUNT'

    AND ffvv.enabled_flag = 'Y'

    AND ffvv.flex_value = DECODE (fah.asset_type, 'NATU', fab.asset_cost_acct,fab.cip_cost_acct)

    AND sysdate BETWEEN NVL(ffvv.start_date_active,sysdate) AND NVL(ffvv.end_date_active,sysdate)) ACCOUNT_DESCRIPTION

         ,(fl.segment1||'.'||fl.segment2||'.'||fl.segment3||'.'||fl.segment4||'.'||fl.segment5) location

       ,SUM((select distinct(original_cost)

         from fa_books

         where ASSET_ID = fah.ASSET_ID

         and BOOK_TYPE_CODE = 'IBM CORP')) BEGINNING_ASSET_BALANCE

from fa_category_books fab,

     fa_asset_history  fah,

     fa_distribution_history fdh,

     fa_locations            fl 

where 1=1

and fab.BOOK_TYPE_CODE = 'IBM CORP'

and fdh.asset_id = fah.ASSET_ID

and fab.CATEGORY_ID = fah.CATEGORY_ID

AND fdh.location_id = fl.location_id

GROUP BY --fah.ASSET_ID

        DECODE (fah.asset_type, 'NATU', fab.asset_cost_acct,fab.cip_cost_acct)

        ,(fl.segment1||'.'||fl.segment2||'.'||fl.segment3||'.'||fl.segment4||'.'||fl.segment5);

Thanks