What is the number of staff living in Port Melyssa and what are their names? | first name or last name? | both please
SELECT T2.first_name, T2.last_name FROM Addresses AS T1 JOIN Staff AS T2 ON T1.address_id  =  T2.staff_address_id where T1.city  =  "Port Melyssa"
number of staff and their names living in a specific city refers to counting and selecting first name and last name from a join between Addresses and Staff tables on address_id = staff_address_id where city matches the given city;