使用 BigQuery SQL 的平均值和最新值

Question

我有一些这样的数据：

Product	Price	Date
Product A	1.00	2021-11-01
Product A	2.00	2021-11-02
Product B	3.00	2021-11-01
Product B	4.00	2021-11-02

我需要一张表中每种产品的平均价格和最新价格，所以它应该如下所示：

Product	Avg(Price)	Latest(Price)
Product A	1.50	2.00
Product B	3.50	4.00

总而言之，我只需要将这些组合到查询中：

SELECT  Price  FROM MyTable
where Date = (select max(Date) FROM MyTable)
group by Product

和

SELECT  Avg(Price) FROM MyTable
group by Product

如何编写才能正常工作？

Answer 1

考虑以下方法

select distinct product, 
  avg(price) over prod as avg_price, 
  first_value(price) over(prod order by date desc) latest_price
from mytable
window prod as (partition by product)   

如果应用于您问题中的样本数据 - 输出是