select 
    t1.EMP_CODE as CODE
    ,t1.EMP_LAST_NAME as SURNAME
    ,t1.EMP_FIRST_NAME as NAME
from EMP t1
    inner join EMP t2
    on replace(t1.EMP_LAST_NAME,' ','') || replace(t1.EMP_FIRST_NAME,' ','')
    = replace(t2.EMP_LAST_NAME,' ','') || replace(t2.EMP_FIRST_NAME,' ','')
    and t1.EMP_CODE != t2.EMP_CODE
where t1.VALID_FLG = '1' and t2.VALID_FLG = '1'
order by 
    replace(t1.EMP_LAST_NAME,' ','')
    ,replace(t1.EMP_FIRST_NAME,' ','')
    ,t1.EMP_CODE