Abstract: On the basis of database relational model, the idea of entity bag (or entity set) model is discussed in this paper, and so are its technique methods. These are easy to put to practice and very useful for optimizing database operations, they also have application value in the aspects of software maintenance, data analysis etc.

摘要： 在数据库关系模式的基础上讨论实体包（或实体集合的模型思想和设计实现方法，它简便易行，对优化数据库操作有明显作用，而且在软件维护、数据分析等方面具有应用价值。

关键词: 实体包, 实体隶属公式, 实体包操作

CLC Number: 

• TP311