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(num),0) as staff_nums
from (
select
(length(course)-length(replace(course,'course', '')))/length("course") as num
from cultivate_tb
) as A