Query to find the Position Attached to Username in Oracle Apps

SELECT pos.name position_name, pa.position_id,fnd.user_name
FROM PER_ALL_ASSIGNMENTS_F pa, per_positions pos,per_jobs job, fnd_user fnd
WHERE pa.POSITION_ID = pos.POSITION_ID
and pa.job_ID = job.job_id
and sysdate between pa.EFFECTIVE_START_DATE
and pa.EFFECTIVE_END_DATE
and pa.primary_flag = 'Y'
and pa.assignment_type = 'E'
and pa.person_id = fnd.employee_id
and pa.PERSON_ID = (select employee_id
from fnd_user
where user_name = '&user_name')