Temp table and insert the unique Ids into another table, with SQL-Server

Question

How to loop through the temp table and insert the unique Ids into another table?

SELECT Id
INTO #TempSubjectValues
FROM WebPortalDemo2DB_Dev_November.dbo.Subject_Value
WHERE SubjectId = @SubjectID_Latest
    
DECLARE @i INT
    
SELECT @i = min(Id)
FROM #TempSubjectValues
    
DECLARE @max INT
    
SELECT @max = max(Id)
FROM #TempSubjectValues
    
WHILE @i <= @max
BEGIN
     INSERT INTO WebPortalDemo2DB_Dev_November.dbo.SubjectValueDetails (
     [Value_Name]
     ,[Value_Details]
     ,[ParentValueDetailId]
     ,[Subject_ValueId]
     ,[isDeleted]
     ,[DeletedDate]
     ,[DeletedBy]
     )
SELECT [Value_Name]
      ,[Value_Details]
      ,[ParentValueDetailId]
      ,@i
      ,[isDeleted]
      ,[DeletedDate]
      ,[DeletedBy]
FROM SubjectValueDetails
WHERE Subject_ValueId IN (
                        SELECT Id
                        FROM Subject_Value
                        WHERE SubjectId = @SubjectID
                        )
    
SET @i = @i + 1
END

This loop inserts duplicate data but what I want is to insert records that It picks in select statement but the [Subject_ValueId] shall be the one that has been inserted into the Subject_Value table which I am already storing in the temp table.

The reason is that we need the new primary key of parent if we are inserting while picking from another table and database.

Answer 1

Not sure if this going to work without sample data. Uncomment the line for the insert once you are sure the select results are correct.

--  INSERT INTO WebPortalDemo2DB_Dev_November.dbo.SubjectValueDetails 
SELECT  DISTINCT
        [Value_Name]            =   SVD.[Value_Name]
     ,  [Value_Details]         =   SVD.[Value_Details]
     ,  [ParentValueDetailId]   =   SVD.[ParentValueDetailId]
     ,  [Subject_ValueId]       =   SVD.ID
     ,  [isDeleted]             =   SVD.[isDeleted]
     ,  [DeletedDate]           =   SVD.[DeletedDate]
     ,  [DeletedBy]             =   SVD.[DeletedBy]

FROM    SubjectValueDetails                             SVD
JOIN    WebPortalDemo2DB_Dev_November.dbo.Subject_Value SVN ON  SVN.SubjectID   =   SVD.ID
JOIN    Subject_Value                                   SV  ON  SV.ID           =   SVD.Subject_ValueId

WHERE   
        SV.SubjectId    =   @SubjectID          --  IDK where this value come from
    AND SVN.SubjectId   =   @SubjectID_Latest   --  IDK where this value come from