我在產品交付表單中有兩組輸入 -收件人信息（必填）) - (country, state, city, zipcode, street, contact_no)alternate_recipient_information（可選）) - (country, state, city, zipcode, street, recipient name, contact_no)我需要一個高效靈活的數據庫模式，以下是我認為可能適合我的模式：userid, name, emailcountryid, country, iso_codestateid, state, country_idcityid, city, state_idaddress_typeid, type1   required2   optionaladdressid, street(null), city_id(null), state_id(null), country_id(null), type_idrecipientid, user_id, address_id, contact_noalternate_recipientid, name, address_id, contact_nodelivery_infoid, recipient_id, alt_recipient_id(null)或者我應該只對必需和可選的數據集使用兩個單獨的表，還是我可以使用？有沒有更好的解決方案？