Sql Linq查询

Question

请让我知道我将如何使Linq查询出来。

SELECT 
[GroupBy1].[K1] AS [AccountName], 

[GroupBy1].[K2] AS [LeadBy], 

[GroupBy1].[K3] AS [Status], 

[GroupBy1].[K3] AS [Industry], 

[GroupBy1].[A1] AS [C2] 

FROM (SELECT 
    [Extent1].[AccountName] AS [K1], 

    [Extent2].[LeadBY] AS [K2], 

    [Extent2].[Status] AS [K3], 

    [Extent2].[Industry] AS [K4], 

    COUNT(1) AS [A1] 

    FROM [dbo].[Opportunities] AS [Extent1] 

    join [dbo].[Leads] AS [Extent2] 

    on [Extent1].[AccountName] IS NOT NULL 

    AND [Extent1].[AccountName]=[Extent2].[AccountName] 

    GROUP BY [Extent1].[AccountName],[Extent2].[Leadby],[Extent2].[Status],[Extent2]. 
[Industry] 
) AS [GroupBy1] 

Answer 1

尝试使用这个程序： http://www.linqpad.net/它有一个基本的和先进的操作实例。您也可以下载其他教程。

Answer 2

它deppends你的映射，如果你还没有一个外键领先进入帐户名栏，你应该试试这个：

from i in Context.Opportunities 
join l in Context.Leads on l.AccountName equals i.AccountName 
group i by new { i.AccountName, l.LeadBY, l.Status, l.Industry } into g 
select new 
{ 
    g.Key.AccountName, 
    g.Key.LeadBY, 
    g.Key.Status, 
    g.Key.Industry, 
    Count = g.Count(); 
} 

，如果你有一个外键领先进入帐户名栏，你应该试试这个：

from i in Context.Opportunities 
group i by new { i.AccountName, l.Lead.LeadBY, l.Lead.Status, l.Lead.Industry } into g 
select new 
{ 
    g.Key.AccountName, 
    g.Key.LeadBY, 
    g.Key.Status, 
    g.Key.Industry, 
    Count = g.Count(); 
}