题解 | 统计快递运输时长
统计快递运输时长
https://www.nowcoder.com/practice/bb4196936f15424dbabe76a501186d91
select exp_type,round(avg(tr_time),1) as time from (select exp_number,exp_type,timestampdiff(minute,out_time,in_time)/60 as tr_time from express_tb join exp_action_tb using(exp_number) group by exp_number) as temp group by exp_type order by time
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