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
c.staff_id,
b.course_name
from cultivate_tb as c
join json_table(
concat('["',replace(c.course,',','","'),'"]'),
'$[*]' columns (
course_name varchar(50) path '$'
)
) as b on 1=1
where c.course is not null)
select
count(*) as staff_nums
from t
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