题解 | 统计加班员工占比
统计加班员工占比
https://www.nowcoder.com/practice/6c0a521c36e14c7599eaef858f6f8233
SELECT T3.department,CONCAT(ROUND(SUM(work_hour)/COUNT(work_hour)*100,1),'%') AS ratio FROM (SELECT T2.department,IF(TIMESTAMPDIFF(minute,first_clockin,last_clockin)/60 >9.5,1,0) AS work_hour FROM attendent_tb T1 LEFT JOIN staff_tb T2 ON T1.staff_id=T2.staff_id) AS T3 GROUP BY department ORDER BY ratio DESC
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