T-SQL HIERACHYID.GETROOT

SELECT NodeId.ToString() AS NodeIdPath, dbo.fnGetFullDisplayPath(NodeId) AS NodeIdDisplayPath,*
 FROM  FAMILY
 WHERE NodeId = hierarchyid::GetRoot()
GO

NodeIdPath NodeIdDisplayPath NodeId NodeLevel FamilyId Title
/ 爷爷 0x 0 1 爷爷