start with 条件

  select '' || ca.agency_id deviceId,

               ca.agency_name deviceName,

               '' || ca.par_agency_id parDeviceId

          from cs_agency ca

        connect by prior ca.par_agency_id = ca.agency_id

            --  and ca.par_agency_id != -1

         start with ca.agency_id in

                    (389,999999999)  and ca.agency_id!=999999999

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  select '' || ca.agency_id deviceId,

               ca.agency_name deviceName,

               '' || ca.par_agency_id parDeviceId,

               'B' agencyFlag

          from cs_agency ca

        connect by prior ca.agency_id = ca.par_agency_id --and ca.agency_id != 999999999

         --and ca.par_agency_id != 350

         start with ca.agency_id in

                    (389,350)

                ---

             and ca.par_agency_id != 350                  

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转载自myxieyu.iteye.com/blog/1738889