INSERT INTO exam_record_before_2021 ( uid, exam_id, start_time, submit_time, score ) SELECT uid, exam_id, start_time, submit_time, score FROM exam_record WHERE start_time < "2021-01-01" AND score IS NOT NULL
INSERT INTO exam_record_before_2021 ( uid, exam_id, start_time, submit_time, score ) SELECT uid, exam_id, start_time, submit_time, score FROM exam_record WHERE start_time < "2021-01-01" AND score IS NOT NULL
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