ALTER TABLE `sb_personcertificate`
ADD COLUMN `exam_subject`  varchar(255) NULL COMMENT '考试科目' AFTER `nocrime_photo`,
ADD COLUMN `exam_address`  varchar(255) NULL COMMENT '考点名称' AFTER `exam_subject`,
ADD COLUMN `exam_start`  varchar(50) NULL COMMENT '考试开始时间' AFTER `exam_address`,
ADD COLUMN `exam_end`  varchar(50) NULL COMMENT '考试结束时间' AFTER `exam_start`;