第二题用了两个嵌套，求大佬看看 Select d.sum_view, avg(d.user_avg_age) as avg_age From ( Select c.user_id, count(c.pv_id) as sum_view, avg(c.now_age) as user_avg_age from (select a.user_id, a.pv_id, (a. creat_time-b. creat_time+b.age) as now_age From pv_log a Inner join dimuser b On a.user_id = b.user_id ) c Group by c.user_id ) d Group by d.sum_view