SELECT first_name FROM Students WHERE current_address_id != permanent_address_id
Whose permanent address is different from his or her current address? List his or her first name.
SELECT first_name FROM Students WHERE current_address_id ! = permanent_address_id
select first_name from students where current_address_id ! = permanent_address_id
Whose permanent address is different from his or her current address ? List his or her first name .