Query to find Concurrent Requests submitted by a particular user

Query to find Concurrent Requests submitted by a particular User:

SELECT
    request_id,
    request_date,
    user_concurrent_program_name,
    responsibility_name,   
    argument_text,   
    phase_code,
    status_code,
    logfile_name,
    outfile_name,
    output_file_type
FROM
    fnd_concurrent_requests fcr,
    fnd_concurrent_programs_tl fcp,
    fnd_responsibility_tl fr,
    fnd_user fu
WHERE
    fcr.CONCURRENT_PROGRAM_ID = fcp.concurrent_program_id
    and fcr.responsibility_id = fr.responsibility_id
    and fcr.requested_by = fu.user_id
    and user_name = upper('&USERNAME')
ORDER BY REQUEST_DATE DESC;