题解 | 未下单用户登陆渠道统计
未下单用户登陆渠道统计
https://www.nowcoder.com/practice/5090553d7854458987997a5c91c30975
select channel,count(b.uid) cnt from order_log a right join user_info b on a.uid=b.uid where order_id is null group by channel order by cnt desc,channel limit 1;
