题解 | 统计各岗位员工平均工作时长
统计各岗位员工平均工作时长
https://www.nowcoder.com/practice/b7220791a95a4cd092801069aefa1cae
select
post,
round(avg(timestampdiff(minute,first_clockin, last_clockin)/60),3) as work_hours
from staff_tb a
left join attendent_tb b
on a.staff_id = b.staff_id
where first_clockin is not null and last_clockin is not null
group by post
order by work_hours desc
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