摘要
文章以Visual FoxPro 6.0数据库管理系统为软件平台,通过查询实例阐述结构化查询语言（Structured Query Language,简称SQL）如何反映关系数据库三级模式结构,如何体现关系代数和关系演算思想。
The text uses the Data Base Management System-Visual FoxPro 6.0 as a flat-top building, expands on the Structured Query Language how to explain the three layer structure of relation DB through the select example and how to reflect the thought of relation algebra and relation mathematical calculation.
作者
傅思萍
FU Si-ping （Quanzhou Economic ＆ Trade Potytechnic,Quanzhou 362000,China）
出处
《电脑知识与技术》
2007年第8期606-608,共3页
Computer Knowledge and Technology
关键词
关系数据库三级模式结构
关系代数
关系演算
SQL
the three layer structure of relation DB
relation algebra
relation mathematical calculation
SQL
