如何创建包含嵌套表的对象的Oracle表? [英] How do I create an Oracle table of objects containing nested tables?

问题描述

我的问题类似于 9454933 ，但是我的嵌套表位于对象内.

我希望创建一个用户定义类型的表，其中定义的类型包含一个对象，我的简化设置如下所示:

CREATE TYPE DEMO_TYPE1 AS OBJECT (A1 NUMBER, A2 NUMBER);

CREATE TYPE DEMO_TAB_TYPE1 AS TABLE OF DEMO_TYPE1;

CREATE TYPE DEMO_TYPE2 AS OBJECT (B1 NUMBER, B2 DEMO_TAB_TYPE1);

CREATE TABLE DEMO_TAB1 (C1 NUMBER, C2 DEMO_TYPE2);

如果运行以上命令，则会出现以下错误

The storage clause is not specified for the nested table column or attribute.

这很有意义，但我无法找出正确的语法来解决我尝试过的问题

CREATE TABLE DEMO_TAB1 (C1 NUMBER, C2 DEMO_TYPE2)
NESTED TABLE B2 STORE AS B2_TAB;

但是我尝试过的这个和所有其他变体导致 ORA-00922:选项丢失或无效

那我该如何解决呢?

解决方案

错误的原因是C2不是嵌套表.嵌套表是C2中的B2，因此您应该尝试以下操作:

CREATE TABLE DEMO_TAB1 (C1 NUMBER, C2 DEMO_TYPE2)
NESTED TABLE C2.B2 STORE AS B2_TAB;

请参阅sqlfiddle: sqlfiddle.com/#!4/6c662/1

My question is similar to 9454933 but my nested table is within the object.

I wish to create a table of user defined types where the defined type contains an object, my simplified setup looks like this

CREATE TYPE DEMO_TYPE1 AS OBJECT (A1 NUMBER, A2 NUMBER);

CREATE TYPE DEMO_TAB_TYPE1 AS TABLE OF DEMO_TYPE1;

CREATE TYPE DEMO_TYPE2 AS OBJECT (B1 NUMBER, B2 DEMO_TAB_TYPE1);

CREATE TABLE DEMO_TAB1 (C1 NUMBER, C2 DEMO_TYPE2);

If I run the above I get the following error

The storage clause is not specified for the nested table column or attribute.

This makes sense but I can't work out the correct syntax to fix this I've tried

CREATE TABLE DEMO_TAB1 (C1 NUMBER, C2 DEMO_TYPE2)
NESTED TABLE B2 STORE AS B2_TAB;

but this and every other variation I've tried result in ORA-00922: missing or invalid option

So how do I resolve this?

解决方案

The reason of the error is that the C2 is not a nested table. The nested table is the B2 inside C2, so you should try this:

CREATE TABLE DEMO_TAB1 (C1 NUMBER, C2 DEMO_TYPE2)
NESTED TABLE C2.B2 STORE AS B2_TAB;

See sqlfiddle: sqlfiddle.com/#!4/6c662/1

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