当然，从来不直接对商业关系数据库环境中视图定义主键。
Of course, primary keys are never defined directly against views in a commercial relational database environment.
它可以保持其层次化性质，同时利用关系数据库环境的功能和稳定性。
It proudly maintains its hierarchical heritage, even while exploiting the power and stability of the relational database world.
它提供一个功能丰富的环境，包括表单和报告语言，可以轻松地开发关系数据库应用程序。
It provides a rich environment with forms and reports language for easy development of relational database applications.
应用推荐