C# 需要实体框架查询来生成SQL

我有两张表

A

和

B

<代码>A与

B

以一对多的形式关联（

A

包含

B

的集合）

如何创建实体框架以生成下一个SQL（我应该编写什么linq查询）：

从A.UserId中选择A.UserId，计数（B.ID）
A.ID=B.A\U ID上的左连接B
其中B.当我改变你的ef clouse时，得分

from a in db.A.DefaultIfEmpty()
        join b in db.B 
        on a.ID equals b.A_ID
        where b.Score <= 6
        group a by a.UserId into grouping
        select new 
        {
            UserId = (string) grouping.Key,                       
            RawValue = grouping.Count()
        };

来自db.a.DefaultIfEmpty（）中的
在db.b中加入b
在a.ID上等于b.a_ID
b.Score你能复制粘贴生成的SQL吗？@Jordi刚刚用生成的SQL更新了你正在分组，在分组中你正在做计数和。因此，这不是一个简单的查询开始。您是否尝试过使用工具分析查询？看看它在执行的时候到底在做什么？因为服务器会进行各种优化。“它会返回我所需要的”它不会，它在语义上与原始查询不同。@usr您能告诉我为什么不吗？
from a in db.A
join b in db.B 
on a.ID equals b.A_ID
where b.Score <= 6
group a by a.UserId into grouping
select new 
{
    UserId = (Guid) grouping.Key,                       
    RawValue = grouping.Sum(x => x.Bs.Count())
};

SELECT 
1 AS [C1], 
[Project3].[UserId] AS [UserId], 
 CAST( [Project3].[C1] AS float) AS [C3]
FROM ( SELECT 
    [Project2].[UserId] AS [UserId], 
(SELECT 
    SUM([Filter2].[A1]) AS [A1]
    FROM ( SELECT 
        (SELECT 
            COUNT(1) AS [A1]
            FROM [dbo].[B] AS [Extent5]
            WHERE [Extent3].[ID] = [Extent5].[A_ID]) AS [A1]
        FROM  [dbo].[A] AS [Extent3]
        INNER JOIN [dbo].[B] AS [Extent4] ON [Extent3].[ID] = [Extent4].[A_ID]
        WHERE ([Extent4].[Score] <= 6) 
    )  AS [Filter2]) AS [C1]
FROM ( SELECT 
    [Distinct1].[UserId] AS [UserId]
    FROM ( SELECT DISTINCT 
        [Extent1].[UserId] AS [UserId]
        FROM  [dbo].[A] AS [Extent1]
        INNER JOIN [dbo].[B] AS [Extent2] ON [Extent1].[ID] = [Extent2].[A_ID]
        WHERE ([Extent2].[Score] <= 6) 
    )  AS [Distinct1]
)  AS [Project2]
)  AS [Project3]

from a in db.A.DefaultIfEmpty()
        join b in db.B 
        on a.ID equals b.A_ID
        where b.Score <= 6
        group a by a.UserId into grouping
        select new 
        {
            UserId = (string) grouping.Key,                       
            RawValue = grouping.Count()
        };

SELECT 
        1 AS [C1], 
        [GroupBy1].[K1] AS [UserId], 
        [GroupBy1].[A1] AS [C2]
        FROM ( SELECT 
            [Extent1].[UserId] AS [K1], 
            COUNT(1) AS [A1]
            FROM    ( SELECT 1 AS X ) AS [SingleRowTable1]
            LEFT OUTER JOIN [dbo].[A] AS [Extent1] ON 1 = 1
            INNER JOIN [dbo].[B] AS [Extent2] ON [Extent1].[ID] = [Extent2].[A_ID]
            WHERE [Extent2].[Score] <= 6
            GROUP BY [Extent1].[UserId]
        )  AS [GroupBy1]