题解 | 统计各岗位员工平均工作时长
select post,round(avg(timestampdiff(second,first_clockin,last_clockin)/3600),3) work_hours from staff_tb s left join attendent_tb a on s.staff_id=a.staff_id group by s.post order by work_hours desc
select post,round(avg(timestampdiff(second,first_clockin,last_clockin)/3600),3) work_hours from staff_tb s left join attendent_tb a on s.staff_id=a.staff_id group by s.post order by work_hours desc
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