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(
case
when course in ('course1','course2','course3') then 1
when course in ("course1,course2","course1,course3","course2,course3") then 2
when course in ('course1,course2,course3') then 3
else 0
end
) staff_nums
from cultivate_tb;
