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 a.exp_type, round(avg(timestampdiff(minute,b.out_time,b.in_time)/60),1) as time from express_tb as a join exp_action_tb as b on a.exp_number=b.exp_number group by a.exp_type order by time;
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