A relational database is a collection of data items organised as a set of formally described tables from which data can be accessed or reassembled in many different ways without having to reorganise the database tables. A relational database management system (RDBMS) is a program that lets you create, update, and administer a relational database.
一个 RDBMS(关系数据库管理系统)是一个把数据用相互关联的表格来管理的数据库系统。在正确的数据库设计中，可以确保全部数据只需输入一次，却可以在不同的链接中察看这些数据。