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CREATE TABLE TBL_TEST
(
ID    NUMBER,
NAME VARCHAR2(100 BYTE),
PID   NUMBER                                  DEFAULT 0
);
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INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('1','10','0');
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('2','11','1');
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('3','20','0');
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('4','12','1');
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('5','121','2');
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select * from TBL_TEST
start with id=1
connect by prior id = pid
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select * from TBL_TEST
start with id=5
connect by prior pid = id
===============================================================================================================
ÓÐÒ»ÕÅ±í   t 
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parent 
child 
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дһ¸ösqlÓï¾ä£¬²éѯ³öÖ¸¶¨¸¸ÏÂÃæµÄËùÓеÄ×Ó 
  
±ÈÈç 
  
a   b 
a   c   
a   e 
b   b1 
b   b2 
c   c1 
e   e1 
e   e3 
d   d1 
  
Ö¸¶¨parent=a£¬Ñ¡³ö 
a   b 
a   c   
a   e 
b   b1 
b   b2 
c   c1 
e   e1 
e   e3 
  
SQLÓï¾ä£º 
select   parent,child   from   test   start   with   parent='a' 
connect   by   prior   child=p


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