Oracle數據庫中如果需要使用SQL遞歸語句，應該怎麼寫呢？下面就為您介紹一個Oracle中使用SQL遞歸語句的例子，供您參考。
例子：
pid id
a b
a c
a e
b b1
b b2
c c1
e e1
e e3
d d1
指定pid=a，選出
a b
a c
a e
b b1
b b2
c c1
e e1
e e3
SQL語句：select parent,child from test start with pid='a'
connect by prior id=pid
Oracle SQL遞歸查詢語句：
1、表機構
SQL> desc comm_org_subjection
Name Null? Type
----------------------------------------- -------- ----------------------------
ORG_SUBJECTION_ID NOT NULL VARCHAR2(32) 子鍵
ORG_ID NOT NULL VARCHAR2(32)
FATHER_ORG_ID NOT NULL VARCHAR2(32) 父鍵
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)
2、遞歸查找父結點 org_id為C6000000000001下的所有子結點:
select * from comm_org_subjection a
start with a.org_id='C6000000000001'
connect by prior a.org_subjection_id=a.father_org_id
3、遞歸查找子結點 org_id為C6000000000001下的所有父結點:
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
