In the Oracle object-relational database, an object view let you retrieve, update, insert,
and delete relational data as if it was stored as an object type. You can also define
views with columns that are object datatypes, such as objects, REFs, and collections
(nested tables and VARRAYs).

对象视图
1. 在 Oracle 的对象-关系型数据库中,利用对象视图就可以像操作对象类型一样对关系型数据进行DML操作
2. 用户定义的视图中也可以包含对象数据类型的列,常用的对象数据类型有对象 , REFs等