Select 从嵌套的 table 参考中查询

Question

我有两个对象关系 table：person_table 和 account_table，由对象 person 和 account 构建。一个账户行有一个嵌套的 table 表示所有共享这个账户的人，它的类型是 'customer_list'.

create type person as object(
  id integer,
  name varchar2,
  phone varchar2
);


create type customer_list as table of ref person;

create type account as object(
  accid integer,
  owned_by customer_list,
  balance Integer
);

create table account_table of account;

create table person_table of person;

我想 select 特定人拥有的所有帐户，给定此人的 ID。如何浏览所有嵌套的 table 帐户，查询是什么？我尝试了不成功的查询。

例如

select a.*
from account_table a
where table(a.owned_by) = (select ref(p) from person_table p where p.id=id_given);

谢谢

Answer 1

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 Mr Knox 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。要查找 Mr Knox 拥有的帐户，我们可以运行这个查询，它从 person_table...

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：

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>

Select 从嵌套的 table 参考中查询

Select query from nested table of references

sql

oracle

user-defined-types

nested-table

object-relational-model