What is the address id of Janessa Sawayn?
select staff_address_id from staff where first_name = 'Janessa' and last_name = 'Sawayn'
For that address id, give teh zip code.
select t1.zip_postcode from addresses as t1 join staff as t2 on t1.address_id = t2.staff_address_id where t2.first_name = "Janessa" and t2.last_name = "Sawayn";