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
超暴力
select
sum(case
when course is null then 0
when course like '%,%,%' then 3
when course like '%,%' then 2
when course like '%' then 1
end) as staff_nums
from
cultivate_tb