ALTER TABLE oe ADD FOREIGN KEY (delivery_customer_id) REFERENCES customer (id);
ALTER TABLE oe ADD FOREIGN KEY (delivery_vendor_id) REFERENCES vendor (id);
ALTER TABLE oe ADD FOREIGN KEY (department_id) REFERENCES department (id);
-ALTER TABLE oe ADD FOREIGN KEY (employee_id) REFERENCES employee (id);
ALTER TABLE oe ADD FOREIGN KEY (language_id) REFERENCES language (id);
ALTER TABLE oe ADD FOREIGN KEY (payment_id) REFERENCES payment_terms (id);
ALTER TABLE oe ADD FOREIGN KEY (shipto_id) REFERENCES shipto (shipto_id);