题解 | 统计快递从创建订单到发出间隔时长
统计快递从创建订单到发出间隔时长
https://www.nowcoder.com/practice/be3e56c950724b27aa79b79309147443
select
round(avg(timestampdiff(minute, et.create_time, eat.out_time)/60), 3) as time
from express_tb as et
left join exp_action_tb as eat on et.exp_number = eat.exp_number