SELECT first_name FROM Students WHERE current_address_id != permanent_address_id
What is the first name of the student whose permanent address is different from his or her current one?
SELECT first_name FROM Students WHERE current_address_id ! = permanent_address_id
select first_name from students where current_address_id ! = permanent_address_id
What is the first name of the student whose permanent address is different from his or her current one ?