Of course, primary keys are never defined directly against views in a commercial relational database environment.
当然，从来不直接对商业关系数据库环境中视图定义主键。
It provides a rich environment with forms and reports language for easy development of relational database applications.
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。
Database design is crucial to effectively implement a relational database. In this course we discuss how to model data, database construction, and developing a database in a business environment.
数据库设计是有效地实现关系数据库的关键，该门课程主要介绍如何建立数据模型，数据库的创建以及在商业环境下如何开发数据库。
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