如果没有子项，请隐藏FileCategoryName

Question

我有两个表联合在一起

                     Files
ID | FileName | FileContent | FolderCategoryId |

                     FolderCategory
ID | FolderCategoryName | FolderParentCategoryId |

以下是我的疑问：

WITH UnionFiles(FileCategoryId, FileCategoryName, FileParentCategoryID, FileParentName, FileCategoryType) AS (              
            SELECT fc.ID AS FileCategoryId
            ,fc.FolderCategoryName as FileCategoryName
            ,fcparent.ID AS FileParentCategoryID
            ,fcparent.FolderCategoryName AS FileParentName
            ,FileCategoryType = 0
            FROM [dbo].FolderCategory AS fc 
            LEFT JOIN [dbo].FolderCategory 
            AS fcparent 
            ON fc.FolderParentCategoryId = fcparent.ID

            UNION

            SELECT 
            f.ID as FileCategoryId 
            ,f.FileName as FileCategoryName
            ,f.FolderCategoryId as FileParentCategoryId
            ,ffcparent.FolderCategoryName AS FileParentName
            ,FileCategoryType = 1
            FROM [dbo].Files as f
            LEFT JOIN [dbo].FolderCategory as ffcparent
            ON f.FolderCategoryId = ffcparent.ID
)
SELECT *
FROM UnionFiles

我想要实现的是隐藏没有子级的FileCategoryName。这可能吗？先谢谢