题解 | #删除记录(一)#
删除记录(一)
http://www.nowcoder.com/practice/d331359c5ca04a3b87f06b97da42159c
掌握 timestampdiff(interval,datetime1,datetime2),返回结果是datetime2-datetime1,结果类型是int(推测,不确定)。
DELETE FROM exam_record
WHERE score<60 and TIMESTAMPDIFF(minute,start_time,submit_time)<5
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