题解 | 统计加班员工占比
统计加班员工占比
https://www.nowcoder.com/practice/6c0a521c36e14c7599eaef858f6f8233
#一步到位,不用子查询、with。 select department, concat(round(sum(case when timestampdiff(minute,a.first_clockin,a.last_clockin)/60>9.5 then 1 else 0 end)/count(*)*100,1),'%') as ratio from staff_tb s join attendent_tb a on s.staff_id =a.staff_id group by s.department order by ratio desc;

