pid  id
  a   b  
  a   c    
  a   e  
  b   b1  
  b   b2  
  c   c1  
  e   e1  
  e   e3  
  d   d1  

指定pid=a，选出  
  a   b  
  a   c    
  a   e  
  b   b1  
  b   b2  
  c   c1  
  e   e1  
  e   e3 
SQL语句：select   parent,child   From   test   start   wITh   pid='a'  
connect   by   PRior   id=pid

SQL> desc comm_org_subjection
 Name                                      Null?    TyPE
 ----------------------------------------- -------- ----------------------
 ORG_SUBJECTION_ID                         NOT NULL VArchAR2(32)   子键
 ORG_ID                                    NOT NULL VARCHAR2(32)
 FATHER_ORG_ID                             NOT NULL VARCHAR2(32)   父键
 LOCKED_IF                                 NOT NULL VARCHAR2(1)
 START_DATE                                NOT NULL DATE
 END_DATE                                           DATE
 EDITION_NAMEPLATE                                  NUMBER(8)
 CODE_AFFORD_IF                                     VARCHAR2(1)
 CODE_AFFORD_ORG_ID                        NOT NULL VARCHAR2(32)
 CODING_SHOW_ID                                     NUMBER(8)
 BSFLAG                                             VARCHAR2(1)
 ;mODIFI_DATE                                        DATE
 CREATOR_ID                                         VARCHAR2(32)
 CREATE_DATE                                        DATE
 CREATOR                                            VARCHAR2(35)

select * from comm_org_subjection a
start with a.org_id='C6000000000001'
connect by prior a.org_subjection_id=a.father_org_id

select org_id from comm_org_subjection a
start with a.org_id='C6000000000001'
connect by prior a.father_org_id=a.org_subjection_id