数据分析笔试 第二道编程题一直错误,跪求大佬看看错误原因 select num1 ,if(num2 is null ,0 ,num2) from (select * from (select product ,count(distinct user_id) as num1 from t_user_login group by product)a left join (select count(distinct user_id) as num2 from t_user_login where user_id like '%NetEase%' group by product )...