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_cut,
count(*) as num
from (
select
*,
case
when author_level between 1 and 2 then '1-2级'
when author_level between 3 and 4 then '3-4级'
when author_level between 5 and 6 then '5-6级'
else null
end as level_cut
from answer_tb
join author_tb
using (author_id)
) t
where t.char_len >= 100
group by level_cut
order by num desc
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