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(1) cnt
FROM comment_detail WHERE SUBSTRING_INDEX(SUBSTRING_INDEX(subject_set, ',', 2),',',-1) = '1002'
GROUP BY SUBSTRING_INDEX(subject_set, ',', 1)
ORDER BY SUBSTRING_INDEX(subject_set, ',', 1);
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