INSERT INTO `grade` (grade_id,grade_type,created_at,updated_at) VALUES ('1,GD,2019-12-11 07:17:07,2020-03-20 09:01:36');
INSERT INTO `grade` (grade_id,grade_type,created_at,updated_at) VALUES ('2,SU,2019-12-13 06:24:16,2020-01-13 08:58:56');
INSERT INTO `grade` (grade_id,grade_type,created_at,updated_at) VALUES ('3,AU,2020-01-13 09:04:04,2020-01-28 10:14:07');
INSERT INTO `grade` (grade_id,grade_type,created_at,updated_at) VALUES ('4,ST,2020-07-14 06:52:45,2020-07-14 06:52:45');
