题解 | #话题的分布情况#
话题的分布情况
https://www.nowcoder.com/practice/3f0d5c83b48b450888921b6189be288f
select
substring_index(subject_set,',',1) as subject_id1,
count(id) as cnt
from comment_detail
where substring_index(subject_set,',',2) regexp ',1002$'
group by subject_id1
order by subject_id1;
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