Find the states which do not have any employee in their record.
create table employees (state_province_county varchar, address_id varchar, employee_address_id varchar, PRIMARY KEY (state_province_county)); create table addresses (state_province_county varchar, address_id varchar, employee_address_id varchar, PRIMARY KEY (state_province_county))
select state_province_county from addresses where not address_id in (select employee_address_id from employees)