Write SQL query to solve given problem: List the person IDs and course levels of the affiliated professors in faculty.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.p_id, T3.courseLevel FROM person AS T1 INNER JOIN taughtBy AS T2 ON T1.p_id = T2.p_id INNER JOIN course AS T3 ON T3.course_id = T2.course_id WHERE T1.hasPosition = 'Faculty_aff'