题解 | 统计快递运输时长
with diff_hour as( select t1.exp_type,t2.*,((timestampdiff(minute,t2.out_time,t2.in_time))/60) as diff from express_tb as t1 inner join exp_action_tb as t2 on t1.exp_number = t2.exp_number) select exp_type,round(avg(diff),1) as time from diff_hour group by exp_type order by time asc;
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