-- t_order 增加收件国家中文名称
ALTER TABLE `t_order`
  ADD COLUMN `ConsigneeCountryName` VARCHAR(64) NULL COMMENT '国家中文名称' AFTER `ConsigneeCountry`;

-- 历史数据：按二字码回填中文名
UPDATE `t_order` o
INNER JOIN `t_country` c ON c.`CountryCode` = o.`ConsigneeCountry`
SET o.`ConsigneeCountryName` = c.`ChineseName`
WHERE o.`ConsigneeCountryName` IS NULL OR o.`ConsigneeCountryName` = '';