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) subject_id1, count(id) cnt
from comment_detail
where substring_index(substring_index(subject_set,',',2),',',-1) = 1002
group by subject_id1
order by subject_id1

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