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(timestampdiff(minute,out_time,in_time)/60),1) as time from express_tb join exp_action_tb using(exp_number) group by exp_type order by time