insert into exam_record values
('1','1001','9001','2021-09-01 22:11:12','2021-09-01 23:01:12','90'),
('2','1002','9002','2021-09-04 07:01:02',null,null)
insert into exam_record values
('1','1001','9001','2021-09-01 22:11:12','2021-09-01 23:01:12','90'),
('2','1002','9002','2021-09-04 07:01:02',null,null)
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