题解 | #Where in 和Not in#

删除记录(一)

http://www.nowcoder.com/practice/d331359c5ca04a3b87f06b97da42159c

delete from exam_record where TIMESTAMPDIFF(minute,start_time,submit_time) < 5 and score <60

DELETE from exam_record

where timestampdiff(minute,start_time,submit_time)<5 and score<60;

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