update exam_record set submit_time = '2099-01-01 00:00:00' , score = 0 where submit_time is null and start_time < '2021-09-01 00:00:00'
update exam_record set submit_time = '2099-01-01 00:00:00' , score = 0 where submit_time is null and start_time < '2021-09-01 00:00:00'
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