Question

我有一张名为UserId的表格。我希望对该值求和并按+--------+----------+-------+ | UserId | UserName | Value | +--------+----------+-------+ | 1 | A | 100 | | 1 | B | 200 | | 1 | C | 300 | | 2 | D | 100 | | 3 | E | 200 | | 3 | F | 300 | +--------+----------+-------+分组。

tblEmployee：

userid

我想根据+--------+----------+-------+---------+ | UserId | UserName | Value | Result | +--------+----------+-------+---------+ | 1 | A | 100 | | | 1 | B | 200 | 600 | | 1 | C | 300 | | | 2 | D | 100 | 100 | | 3 | E | 200 | | | 3 | F | 300 | 500 | +--------+----------+-------+---------+对值求和，并显示如下输出。

输出：

var entity=db.(your databasetablename).Create();

怎么做？

Answer 1

select 
userid,username,
value,
sum(value) over (partition by userid) as totalval
from table

Answer 2

如果您不想使用分区，还可以使用带有GROUP BY的子查询来获得所需的输出：

SELECT t1.UserId, t1.UserName, t1.Value, t2.Result
FROM tblEmployee t1
INNER JOIN
(
    SELECT UserId, SUM(Value) AS Result
    FROM tblEmployee
    GROUP BY UserId
) t2
ON t1.UserId = t2.UserId

如何在SQL Server中使用Group by对多个列进行求和？

2 个答案: