ALTER TABLE `volunteer`.`cmf_volunteer`
ADD COLUMN `study_time` decimal NULL COMMENT '学习时长' AFTER `refund_reason`,
ADD COLUMN `use_time` decimal NULL COMMENT '使用时长' AFTER `study_time`;

ALTER TABLE `volunteer`.`cmf_volunteer`
ADD COLUMN `is_official` tinyint(4) NULL COMMENT '是否为正式志愿者' AFTER `use_time`;