staff table lists all staff members,
including information for email address, login information,
staff_id: A surrogate primary key that uniquely identifies the staff member.
first_name: The first name of the staff member.
last_name: The last name of the staff member.
address_id: A foreign key to the staff member address in the
BLOBcontaining a photograph of the employee.
store_id: The staff member “home store.” The employee can work at other stores but is generally assigned to the store listed.
active: Whether this is an active employee. If employees leave, their rows are not deleted from this table; instead, this column is set to
username: The user name used by the staff member to access the rental system.
password: The password used by the staff member to access the rental system. The password should be stored as a hash using the
last_update: When the row was created or most recently updated.