ALTER TABLE `sys_country_code`
  ADD COLUMN `alias_codes` varchar(255) NOT NULL DEFAULT '' COMMENT '国家code别名集合(JSON数组)' AFTER `alias_name`;

UPDATE `sys_country_code`
SET `alias_codes` = '["SA","KSA"]'
WHERE `alpha_two` = 'SA' OR `alpha_three` = 'KSA';