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 a inner join exp_action_tb b on a.exp_number = b.exp_number group by exp_type order by time
