Question

我有这个非常大的聚合函数，我必须在另一列中使用两次，有没有办法写下来而不必写出第一个函数三次？所以我想要这样的事情：

Select
volumet =
CASE When sum(volume)>200, then 200
     Else sum(volume)
END,
sum(volumet * price) / volumet - price2 * volumet as Profit
FROM tablex

Answer 1

Select
sum(volumet * price) / volumet - price2 * volumet as Profit
FROM
(Select
CASE When sum(volume)>200, then 200
     Else sum(volume)
END as volumet, price, price2
FROM tablex) as tableAux

Answer 2

根据您的原始帖子，这样的内容应该是您正在寻找的内容。

WITH CTE 
AS
(
    SELECT
        sum(volumet) AS volumet
    ,   price
    ,   price2
    FROM tablex
    group by price, price2
)
, VolumetValues as
(
    select case when volumet > 200 then 200 else volumet end as volumet
        , price
        , price2
    from CTE
)

SELECT 
    (volumet * price) / volumet - price2 * volumet as Profit
FROM VolumetValues

在SELECT语句SQL中的其他聚合函数中使用聚合函数

2 个答案: