题解 | #小破站9月新会员人数#
小破站9月新会员人数
http://www.nowcoder.com/practice/aaa8bf0381cf4f6ca53665cea37e405e
select count(distinct(user_id)) new_cnt
from detail_list_tb
where month(begin_date)=9
and user_id not in
(select user_id from detail_list_tb where month(begin_date)<9)
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