题解 | 统计商家不同会员每日访问人次及访问人数
统计商家不同会员每日访问人次及访问人数
https://www.nowcoder.com/practice/0017dc22426b495889da3304dcf254d1
select b.vip,count(a.user_id) as visit_nums,count(distinct b.user_id) as visit_users from visit_tb a join uservip_tb b on a.user_id=b.user_id group by b.vip order by visit_nums desc
多表连接后，b表数据行会增加，所以去重count(distinct b.user_id)
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