Question

我有一个precipitation_full表，并且有以下架构

    station_id
    day
    precipitation

现在我想得到station_id平均降水量＆gt; 75与group by。我在jupyter中使用了这段代码，但结果不正确：

select station_id 
from precipitation_full 
group by station_id  
having avg(precipitation) > 75

如何使用Group by和嵌套查询执行此操作？

Answer 1

试试这个：

SELECT station_id, AVG(precipitation)
FROM precipitation_full
GROUP BY station_id
HAVING AVG(precipitation)>75

Answer 2

James5'回答看起来是正确的。但是如果你想要所有行（不仅仅是唯一的station_ids），请使用：

;with _intermediate as (
    select
        *,
        avg(precipitation) over (partition by station_id) as AveragePrecipitation
    from precipitation_full
)
select
    station_id,
    [day],
    precipitation
from _intermediate
where
    AveragePrecipitation > 75

在我的回答中，我假设您使用Sql Server。

Answer 3

你在找这样的东西吗？

SELECT *
FROM precipitation_full 
WHERE station_id IN (
        SELECT station_id 
        FROM precipitation_full 
        GROUP BY station_id  
        HAVING AVG(precipitation) > 75
    )

在sql中使用Group by

3 个答案: