如何在SQL中对AS列求和

我有以下代码

SELECT WF.Word, WF.Frequency, WW.Weight, (WF.Frequency * WW.Weight) AS Product
FROM WF 
INNER JOIN WW ON WW.Word = WF.word

它输出以下内容

WORD        | FREQUENCY | WEIGHT | PRODUCT
Fat           3           2        6
Ugly          2           4        8
Stupid        1           7        7

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我还想同时对乘积列求和。我知道如何对现有列求和，但不确定如何对我正在创建的列求和。

您缺少一个

分组依据。

。所需的结果集是什么？上面显示了什么，加上一个单独的表，其中只有一个名为ProductSum的列，其中有21个列。

SELECT SUM(WF.Frequency * WW.Weight) AS Product
FROM WF 
INNER JOIN WW ON WW.Word = WF.word

SELECT WF.Word, SUM(WF.Frequency) Frequency, SUM(WW.Weight) Weight, SUM(WF.Frequency * WW.Weight) AS Product
FROM WF 
INNER JOIN WW ON WW.Word = WF.word
GROUP BY WF.Word
;
SELECT SUM(WF.Frequency * WW.Weight) Product
FROM WF 
INNER JOIN 
WW ON WW.Word = WF.word