基于1列的SQL Aggregate函数并显示剩余的

Question

我试图对1列的值求和并将其仅按1列分组，但还要显示其他列。

基本上，如果数据看起来像：

Column1   Column2 Column3 Column4
----------------------------------
Col1Data0  Test1   Test2      1
Col1Data0  Test1   Test2      3
Col1Data1  Test1   Test2      2
Col1Data1  Test1   Test2      5

查询应输出：

Column1   Column2 Column3 Column4
Col1Data0  Test1   Test2      4
Col1Data0  Test1   Test2      4
Col1Data1  Test1   Test2      7
Col1Data1  Test1   Test2      7

Answer 1

您可以使用SUM窗口函数：

测试数据：

declare @t table (Column1 varchar(10), Column2 varchar(10), Column3 varchar(10), Column4 int)
insert into @t values 
('Col1Data0','Test1','Test2',1),
('Col1Data0','Test1','Test2',3),
('Col1Data1','Test1','Test2',2),
('Col1Data1','Test1','Test2',5)

查询：

SELECT Column1, Column2, Column3, 
    SUM(Column4) OVER (PARTITION BY Column1) AS SumColumn4
FROM @t

返回值：

Column1     Column2 Column3 SumColumn4
Col1Data0   Test1   Test2   4
Col1Data0   Test1   Test2   4
Col1Data1   Test1   Test2   7
Col1Data1   Test1   Test2   7