题解 | #用户首次登录后次3日内活跃天数#
用户首次登录后次3日内活跃天数
https://www.nowcoder.com/practice/d2226bb30ecb414f9dbf2dc1ba641324
select
a.id,
count(b.id)
from
user_visit_log a
left join user_visit_log b on a.id = b.id
and timestampdiff (day, a.visit_date, b.visit_date) < 3
and timestampdiff (day, a.visit_date, b.visit_date) >= 1
group by
a.id
order by
a.id
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