这是我的测试数据:
SQL> select * from person_table;
ID NAME PHONE
---------- ------------------------------ ------------
11 MR KNOX 07000700811
22 SAM-I-AM 07000700822
SQL> select * from account_table;
ACCID
----------
OWNED_BY
--------------------------------------------------------------------------------
BALANCE
----------
123
CUSTOMER_LIST(00002202084B026AE209637509E050007F010047FD4B026AE209627509E050007F010047FD
, 00002202084B026AE209647509E050007F010047FD4B026AE209627509E050007F010047FD)
9900
345
CUSTOMER_LIST(00002202084B026AE209637509E050007F010047FD4B026AE209627509E050007F010047FD)
30
SQL>
Sam-I-Am 和 Knox 先生是第一个帐户的共同所有者,而 Knox 先生是第二个帐户的唯一所有者。person_table
要查找 Knox 先生拥有的帐户,我们可以运行此查询,它从...中查找 REF
SQL> select acct.accid
2 , acct.balance
3 , deref(value(ob)).name as owned_by
4 , deref(value(ob)).phone as ntact_noco
5 from account_table acct
6 cross join table(acct.owned_by) ob
7 where ob.column_value = ( select ref(p) pref
8 from person_table p
9 where p.name = 'MR KNOX')
10 /
ACCID BALANCE OWNED_BY NTACT_NOCO
---------- ---------- ------------------------------ ------------
123 9900 MR KNOX 07000700811
345 30 MR KNOX 07000700811
SQL>
或者,我们可以使用 DEREF 语法查找人员:
SQL> select acct.accid
2 , acct.balance
3 , deref(value(ob)).name as owned_by
4 , deref(value(ob)).phone as contact_no
5 from account_table acct
6 cross join table(acct.owned_by) ob
7 where deref(value(ob)).id = 11
8 /
ACCID BALANCE OWNED_BY CONTACT_NO
---------- ---------- ------------------------------ ------------
123 9900 MR KNOX 07000700811
345 30 MR KNOX 07000700811
SQL>