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 et join exp_action_tb ea on et.exp_number=ea.exp_number group by exp_type order by time;