由过去7天限制的分区平均值

Question

我有一个跨越过去30天的查询，它总计了总收入，但我也想要最近30天的总和，加上过去7天的平均值。我想要这样的东西：

select 
    country 
    , avg(revenue) over (partition by country range between current_date - 7 and current_date) avg_revenue_last_7_days
    , sum(revenue) total_revenue_30_days
from table 
group by 1,2

是否可以获得比聚合所基于的更少天数的平均值？

我想避免使用子查询，因为查询已经很复杂了。

Answer 1

您不需要窗口函数，只需要条件聚合：

select country,
       avg(case when datecol between current_date - 7 and current_date
                then revenue
           end) as avg_revenue_last_7_days,
       sum(case when datecol between current_date - 30 and current_date
                then revenue
           end) as total_revenue_30_days
from table 
group by country;