ALTER TABLE COUNTRY_ORGANIZATION ADD CONSTRAINT FK_COUNTRY_ORGANIZATION_COUNTRY FOREIGN KEY (COUNTRY_CODE) REFERENCES COUNTRY(CODE);

ALTER TABLE COUNTRY_ORGANIZATION ADD CONSTRAINT FK_COUNTRY_ORGANIZATION_ORGANIZATION FOREIGN KEY (ORGANIZATION_CODE) REFERENCES ORGANIZATION(CODE);

ALTER TABLE COUNTRY ADD CONSTRAINT FK_COUNTRY_CONTINENT FOREIGN KEY (CONTINENT) REFERENCES CONTINENT(NAME);

ALTER TABLE COUNTRY ADD CONSTRAINT FK_COUNTRY_CITY FOREIGN KEY (CAPITAL) REFERENCES CITY(ID);

ALTER TABLE CITY ADD CONSTRAINT FK_CITY_COUNTRY FOREIGN KEY (COUNTRY_CODE) REFERENCES COUNTRY(CODE);

ALTER TABLE COUNTRY_LANGUAGE ADD CONSTRAINT FK_COUNTRY_LANGUAGE_COUNTY FOREIGN KEY (COUNTRY_CODE) REFERENCES COUNTRY(CODE);