题解 | #删除记录（二）#
删除记录（二）
https://www.nowcoder.com/practice/964c9f7fffbb4ab18b507cfed4111b4a
delete from exam_record
where
submit_time is null
or TIMESTAMPDIFF (minute, start_time, submit_time) < 5
order by
start_time
limit
3;
关键是排序之后用到 `limit`来进行选择前三行
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