题解 | 统计所有课程参加培训人次
统计所有课程参加培训人次
https://www.nowcoder.com/practice/98aad5807cf34a3b960cc8a70ce03f53
select round(sum(case when course like '%,%' then (LENGTH(course)-LENGTH(replace(course,',','')))/length(',')+1 else 1 end),0) staff_nums
from cultivate_tb where course IS NOT NULL
