Absences Leave Entries

select  per.person_number,
            abs.name absence_type,
            to_char(apae.start_date,'DD-MON-YYYY','NLS_DATE_LANGUAGE = AMERICAN')  start_date,
            to_char(apae.end_date,'DD-MON-YYYY','NLS_DATE_LANGUAGE = AMERICAN')  end_date,
            duration
from ANC_PER_ABS_ENTRIES apae,
         PER_PERIODS_OF_SERVICE pps,
         PER_ALL_PEOPLE_F per,
   ANC_ABSENCE_TYPES_VL abs
where apae.period_of_service_id = pps.period_of_Service_id
    and apae.absence_type_id = abs.absence_type_id
    and pps.person_id = per.person_id
 and trunc(sysdate) between abs.effective_start_date and abs.effective_end_Date
 and trunc(sysdate) between per.effective_start_date and per.effective_end_Date
 order by per.person_number