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CREATE Function GetParentUnit(@UnitId bigint, @Level int) 
Returns @Parents Table([UnitId] int ,[UnitName] nvarchar(64),[ParentUnitId] int) 
As 
Begin
    If @Level < 1   --Èç¹û²ÎÊý@LevelСÓÚ“1”£¬ÔòµÃµ½ËùÓи¸µ¥Î»
        Begin        
            Insert @Parents 
                Select UnitId,UnitName,ParentUnitId 
                from [T_Unit] 
                Where [UnitId] = (Select [ParentUnitId] 
                from [T_Unit] Where [UnitId]=@UnitId)        
            
            While @@ROWCOUNT > 0
                Begin                     
                    Insert @Parents
                        Select B.UnitId,B.UnitName,B.ParentUnitId 
       


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