c# - INNER JOINではなくSub Selectを使用するEntity Framework

Question

私は以下のようなクラスを持っています

public class Team
{
    [Key]
    public virtual Int32 TeamId { get; set; }
    [Required]
    public virtual String Name { get; set; }
    public virtual String Description { get; set; }
    public virtual ICollection<TeamFeed> TeamFeeds { get; set; }
}

public class TeamFeed
{       
    public Int32 TeamFeedId { get; set; }
    [Required]
    public Int32 TeamId { get; set; }
    public virtual bool IsEnabled { get; set; }
    public virtual Team Team { get; set; }
}

私は持っていLazyLoadingEnabled = falseますProxyCreationEnabled = false

私がする時

var team = db.Teams.Where(x => x.TeamId == 1).Include(x=>x.TeamFeeds);

EF によって生成される SQL は次のようになります。

SELECT 
[Project1].[TeamId] AS [TeamId], 
[Project1].[Name] AS [Name], 
[Project1].[Description] AS [Description], 
[Project1].[C1] AS [C1], 
[Project1].[TeamFeedId] AS [TeamFeedId], 
[Project1].[TeamId1] AS [TeamId1], 
[Project1].[IsEnabled] AS [IsEnabled], 
FROM ( SELECT 
    [Extent1].[TeamId] AS [TeamId], 
    [Extent1].[Name] AS [Name], 
    [Extent1].[Description] AS [Description],  
    [Extent2].[TeamFeedId] AS [TeamFeedId], 
    [Extent2].[TeamId] AS [TeamId1], 
    [Extent2].[IsEnabled] AS [IsEnabled],  
    CASE WHEN ([Extent2].[TeamFeedId] IS NULL) THEN CAST(NULL AS int) ELSE 1 END AS [C1]
    FROM  [dbo].[Teams] AS [Extent1]
    LEFT OUTER JOIN [dbo].[TeamFeeds] AS [Extent2] ON [Extent1].[TeamId] = [Extent2].[TeamId]
    WHERE 1 = [Extent1].[TeamId]
)  AS [Project1]
ORDER BY [Project1].[TeamId] ASC, [Project1].[C1] ASC

私が使用するSQLを使用せず、長いSQLステートメントを作成した理由がわかりません。

SELECT 
* --use all just for clarity in the example
FROM TEAMS T

INNER JOIN TEAMFEEDS TF
ON T.TEAMID = TF.TEAMID

ORDER BY 
T.TEAMID

私はEFが初めてなので、何かを理解していない可能性があります。

ありがとう