题解|存疑不去重?高质量的回答中用户属于各级别的数量#
某乎问答高质量的回答中用户属于各级别的数量
https://www.nowcoder.com/practice/69c85db3e59245efb7cee51996fe2273
## 高质量回答中属于各级别的数量 SELECt (CASE WHEN author_level in (5,6) THEN '5-6级' WHEN author_level in (3,4) THEN '3-4级' ELSE '1-2级' END ) AS level_cnt, COUNT(a.author_id) AS num FROM answer_tb a LEFT JOIN author_tb b ON a.author_id = b.author_id WHERE char_len >= 100 GROUP BY level_cnt ORDER BY num DESC