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 t1.exp_type ,round(avg(timestampdiff(minute,t2.out_time,t2.in_time)/60),1) as time from express_tb t1 left join exp_action_tb t2 on t1.exp_number = t2.exp_number group by t1.exp_type order by time asc
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