题解 | #更新记录（二）#
更新记录（二）
https://www.nowcoder.com/practice/0c2e81c6b62e4a0f848fa7693291defc
update exam_record
set submit_time = '2099-01-01 00:00:00',
score = 0
where score is null
and date(start_time) < '2021-09-01';
set submit_time = '2099-01-01 00:00:00',
score = 0
where score is null
and date(start_time) < '2021-09-01';
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