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