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我在oracle数据库中有以下对象表。在oracle中嵌套表和对象类型有什么区别?
create type deposit_ty as object
(
depno number(6),
depcategory ref depcategory_ty,
amount number(6),
period number(2)
);
create type deposit_ntty as table of deposit_ty;
create type address_ty as object
(
homeno number,
street varchar(30),
city varchar(30)
);
create type customer_ty as object
(
cusid char(4),
custname varchar(40),
address address_ty,
dob DATE,
deposits deposit_ntty
);
任何一个可以告诉是什么customer_ty对象表address
列,deposits
之间的区别?