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 sum(cnt) staff_nums from( select (case when course is null then 0 else length(course)- LENGTH(REPLACE(course, ',', '')) + 1 end) as cnt from cultivate_tb) as t
