mvc5从select中创建select

Question

这是表格：

id subject number type
1  1       12     1
2  1       13     1
3  1       14     1

4  1       3      2
5  1       12     2
6  1       14     2

需要

的结果

subject   sum-number   type
1         39            1
1         29            2

如何使用mvc 5中的lambda表达式查询它

Answer 1

仅SQL

select subject, sum(number), type
from table
group by subject, type

Answer 2

SQL查询，如

    select subject, sum(number), type from table group by type, subject

Answer 3

我猜您可以使用以下LINQ查询：

var result = context.tableName.GroupBy(x => x.type).Select(x => new { subject = x.First().subject , sum-number = x.Sum(y => y.number) });