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
with t as(
select
staff_id,
if(course like '%1%',1,0) as course1,
if(course like '%2%',1,0) as course2,
if(course like '%3%',1,0) as course3
from cultivate_tb
where course is not null)
select sum(course1)+sum(course2)+sum(course3) as staff_nums
from t
，再说不用上高数吗？
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