Accesses the city versus zip code database. Finds the city for a zip code. SELECT CITY FROM DEMO.CITY_TAB WHERE ZIPCODE = :zipcode Inserts a new zip code and city into the database. INSERT INTO DEMO.CITY_TAB (ZIPCODE, CITY) VALUES (:zipcode, :city) Updates the city for a zip code. UPDATE DEMO.CITY_TAB SET CITY = :city WHERE ZIPCODE = :zipcode Deletes a zip code from the database. DELETE FROM DEMO.CITY_TAB WHERE ZIPCODE = :zipcode