题解 | #删除记录（一）#
删除记录（二）
http://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 asc limit 3 #delete 本质就是把按条件查找到的语句删了，所以不需要在delete 后面＋个select 语句了 #limit的用法 limit x,y 跳过x取y 条数据
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