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
date (start_time) < '2021-09-01'
and submit_time is null
不要忽略了更新的条件 `submit_time is null`
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