Question

我的类型和表格如下，

create type investments_type as object(
  company ref stocks_type,
  purchase_price number(12,2),
  date_purchased date,
  qty number
);

create type investments_table_type as table of investments_type;

create type clients as object(
  client_name varchar(50),
  address address_type,
  investments investments_table_type
);

create table clients_table of clients
NESTED TABLE investments STORE AS investments_table;

现在我要做的是根据qty更新investments_type中的date_purchased。

我试过像这样做，

update clients_table
set investments = CAST(MULTISET(
select investments_type(company,purchase_price,date_purchased,qty+100)
from table(investments) i
where i.date_purchased < '01-MAR-00') as investments_table_type)

但是这会替换表中的所有其他值。

如何只更新满足where条件的行的qty值而不替换任何其他行？

修改

这就是我设法做到的。

update table(select c.investments
             from clients_table c) i
set i.qty = i.qty + 100
where i.date_purchased < '01-MAR-00';

Answer 1

您可以将对象类型转换为表格并更新此表格。它看起来像这样（未经测试）：

update 
    (select purchase_price, date_purchased, qty 
    from clients_table 
    natural join table(investments) 
    where date_purchased < '01-MAR-00')
set qty = qty + 100;

我身边的小提示：当你想要了解Oracle对象类型时，从更简单的结构开始，而不是“对象表的对象对象”

如何在Oracle11g中更新嵌套表类型中的单个值？

1 个答案: