The concept of inheritance throws in several interesting twists when saving objects into a relational database.
在将对象保存到关系数据库中时，继承的概念中发生几个有趣的问题。
The ability to manage such a relationship is similar in concept to relationship modeling in modern relational database technology.
管理这样一个关系在概念上同现代关系数据库技术中的关系建模相似。
To overcome this restriction and to maximize the flexibility of a relational database system, DB2 V9.5 introduces the concept of global variables.
为克服这种约束并最大化实现关系数据库系统的灵活性，DB2 V9.5 引入了全局变量的概念。
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