SQL基于1列的聚合函数并显示剩余的

Question

我正在尝试对 1 列的值求和并将其仅按 1 列分组，但同时显示其他列。

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

查询应该输出：

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

Answer 1

您可以使用子查询获取第 1 列的总和并将其合并以获得输出

Select a.Column1,a.Column2,a.Column3,b.summ 
FROM Table a
INNER JOIN (Select column1,sum(Column4) summ from Table group by column1) b
on b.column1 = a.column1

Answer 2

使用标量子查询

select Column1,Column2,Column3,
(
 select sum(Column4) from tablename b 
 where a.Column1=b.Column1 and a.Column2=b.Column2 and a.Column3=b.column3
) as column4
from tablename a

Answer 3

您可以使用 SUM window 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

Returns:

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

SQL基于1列的聚合函数并显示剩余的

SQL Aggregate function based on 1 column and display the remaining

sql

sql-server

sql-server-2008