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 et.exp_type exp_type ,round(avg(timestampdiff(minute, out_time, in_time) / 60), 1) time from express_tb et join exp_action_tb eat on et.exp_number = eat.exp_number group by et.exp_type order by time
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