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
s.post as post,
round(avg(timestampdiff(second,first_clockin,last_clockin ) / 3600),3) as work_hours
from
staff_tb s,
attendent_tb a
where
s.staff_id = a.staff_id
group by
s.post
order by
work_hours desc
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