将顶级父级添加到现有SQL查询

我的SQL语句有问题。我想将每个对象的顶部父对象添加到每一行。我尝试了一些方法，但我不得不说我基本上是一个SQL初学者

例如：

Object A: ID 2, ParentID NULL
Object B: ID 10, ParentID 2
Object C: ID 25, ParentID 10
Object D: ID 51, ParentID 25

现在的结果应该是：

Object D: ID 51, ParentID 25, TopParent 2

以下是我目前的疑问：

With
  Geraetetypen(TypID, Typname, ParentID, Ebene) As (Select parentTyp.ID,
      parentTyp.geraeteTyp,
      IsNull(parentTyp.parentID, 0) parentID,
     1 As Ebene
From test_table_GeraeteTyp As parentTyp
Where parentTyp.parentID = 0
Union All
Select childTyp.ID,
  childTyp.geraeteTyp,
  childTyp.parentID,
  gt.Ebene + 1 As Ebene
From test_table_GeraeteTyp As childTyp
  Inner Join Geraetetypen As gt On childTyp.parentID = gt.TypID)
Select *
From
Geraetetypen

现在我得到了ID、名称、ParentID和级别

---

谢谢

将其添加到顶部查询，然后在递归中回显：

With
  Geraetetypen(TypID, Typname, ParentID,       Ebene, TopParent) As (Select parentTyp.ID,
      parentTyp.geraeteTyp,
      IsNull(parentTyp.parentID, 0) parentID,
     1 As Ebene,
     parentTyp.ID TopParent                                                       
From test_table_GeraeteTyp As parentTyp
Where parentTyp.parentID = 0
Union All
Select childTyp.ID,
  childTyp.geraeteTyp,
  childTyp.parentID,
  gt.Ebene + 1 As Ebene,
  gt.TopParent                                                                     
From test_table_GeraeteTyp As childTyp
  Inner Join Geraetetypen As gt On     childTyp.parentID = gt.TypID)
Select *
From
Geraetetypen