题解 | #某乎问答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
select
level_cnt,
count(*) num
from (select
case author_level
when 5 then '5-6级' when 6 then '5-6级'
when 3 then '3-4级' when 4 then '3-4级'
else '1-2级' end level_cnt
from author_tb join answer_tb using(author_id) where char_len>= 100) t group by level_cnt order by num desc;
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