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SELECT rel.*,
           LEVEL AS HIERARCHY
  FROM (
  
                SELECT rt.RTAG_ID, 
                       rt.RTAG_NAME, 
                           rt.DISPLAY_ORDER,
                       DECODE( rt.PARENT_RTAG_ID, 
                                           rt.RTAG_ID, 0, rt.PARENT_RTAG_ID ) AS PARENT_RTAG_ID,
                           rt.OFFICIAL,
                            rt.DESCRIPTION,
                                rt.ASSOC_MASS_REF                                          
                  FROM RELEASE_TAGS rt
                 WHERE rt.PROJ_ID = :PROJ_ID  
         
                ) rel
START WITH rel.PARENT_RTAG_ID = 0
CONNECT BY PRIOR rel.RTAG_ID = rel.PARENT_RTAG_ID   
ORDER SIBLINGS BY rel.DISPLAY_ORDER