Find all leaf node records using hierarchyid

hierarchyid, sql-server, sql-server-2008

Solution

SELECT A.HieracrchyId, A.HierarchyId.ToString()
  FROM dbo.TableA AS A 
  LEFT OUTER JOIN dbo.TableA AS B
  ON A.HierarchyId = B.HierarchyId.GetAncestor(1)
  WHERE B.HierarchyId IS NULL;

Problem

How would I go about querying for only records that are "only leaf nodes" (ie. no children)? I have tried a query like this: ``` select * from TableA tt where tt.HierarchyId.GetDescendant(null, null) not in ( Select t.HierarchyId from TableA t ) ``` But this still seemed to return some nodes that had children. I am using the built-in hierarchyid data type (part of ms sqlserver)

Original source

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