SELECT DISTINCT unit_id,
'ABSENT' as Np_Time_Code,
'0' as ASSOC_HOURS,
'T' as CATEGORY,
'Absent' as DESCRIPTION
FROM unit_spec
WHERE Facility_Id = 'HH'
AND Active = 'Y'
AND unit_id NOT IN
( SELECT DISTINCT unit_id FROM unit_np_time WHERE Np_Time_Code = 'ABSENT'
);