select
  EMP_CODE AS CODE
  , EMP_LAST_NAME AS SURNAME
  , EMP_FIRST_NAME AS NAME
from
  EMP
where
  REPLACE(EMP_LAST_NAME || EMP_FIRST_NAME, ' ', '') in (
    select
      REPLACE(EMP_LAST_NAME || EMP_FIRST_NAME, ' ', '') AS NAME
    from
      EMP
    where
      VALID_FLG = '1'
    group by
      NAME
    having
      count(*) >= 2
  )
order by
  REPLACE(EMP_LAST_NAME || EMP_FIRST_NAME, ' ', '')
  , EMP_CODE
;