sqlserver合并查询无法访问标识列中的id值

Question

在5个表之后，哪个主键是级别ID。在userlevel1表中，主键是Level1ID，UserLevel2表主键是Level2ID，它使用外键与UserLevel1表链接。相同结构用户级别3，级别4，级别5

CREATE TABLE [tdm].[UserLevel1](
[UserID] [int],
[Level1ID] [int] IDENTITY(1,1) NOT NULL,
[USerID] [int] NOT NULL,
[LevelName] [nvarchar](50) NOT NULL,
[GeoCode] [nvarchar](50) NULL,
[IsDeleted] [bit] NULL

）

CREATE TABLE [tdm].[UserLevel2](
[Level2ID] [int] IDENTITY(1,1) NOT NULL,
[Level1ID] [int] NOT NULL,
[LevelName] [nvarchar](50) NOT NULL,
[GeoCode] [nvarchar](50) NULL,
[IsDeleted] [bit] NULL
)


CREATE TABLE [tdm].[UserLevel3](
[Level3ID] [int] IDENTITY(1,1) NOT NULL,
[Level2ID] [int] NOT NULL,
[LevelName] [nvarchar](50) NOT NULL,
[GeoCode] [nvarchar](50) NULL,
[IsDeleted] [bit] NULL
)

CREATE TABLE [tdm].[UserLevel4](
[Level4ID] [int] IDENTITY(1,1) NOT NULL,
[Level3ID] [int] NOT NULL,
[LevelName] [nvarchar](50) NOT NULL,
[GeoCode] [nvarchar](50) NULL,
[IsDeleted] [bit] NULL
)

CREATE TABLE [tdm].[UserLevel5](
[Level5ID] [int] IDENTITY(1,1) NOT NULL,
[Level4ID] [int] NOT NULL,
[LevelName] [nvarchar](50) NOT NULL,
[GeoCode] [nvarchar](50) NULL,
[IsDeleted] [bit] NULL
)

对于上表的插入或更新，我已经为每个表使用了MERGE查询。以下代码包含3级表

MERGE INTO tdm.CustomerLevel3 AS [Target]
             USING @TempCustomerLevel3 AS [Source]
             ON [Source].LevelID = [Target].Level3ID 
             WHEN NOT MATCHED 
                AND [Source].[GeoCode]<>'' 
                AND [Source].[LevelName]<>'' 
             THEN
             INSERT
             (
                 [Level2ID]
                ,[LevelName]
                ,[GeoCode]
                ,[IsDeleted]
             )
             VALUES
             (
                  [Source].[ParentLevelID]
                 ,[Source].[LevelName]
                 ,[Source].[GeoCode]
                 ,[Source].[IsDeleted]
             )
             WHEN MATCHED 
             THEN
             UPDATE SET         
                [Level2ID]=[Source].[ParentLevelID]
                ,[LevelName] = [Source].[LevelName]
                ,[GeographyCode] = [Source].[GeographyCode]
                ,[IsDeleted]=IIF([Source].[GeographyCode]<>'' AND [Source].[LevelName]<>'',[Source].[IsDeleted],1);

我为每个级别的表写了5个合并查询。级别1表和级别2可以管理因为它有UserID所以我可以加入表并获取父id值，但是对于插入时的其他表我没有当前我链接到其他表的级别id我通过插入表的重复值的GeoCode链接。