北邮国院--数据库系统笔记

北邮国院–数据库系统笔记

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创建日期：2024年2月29日

说明：更新到开学第一周内的全部内容。

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1 Introduction

Data

Facts and analysis collected together for reference and analysis.

Database

A shared collection of logically related data (and a description of this data) designed to meet the information need of an organization.

DBMS

A software system that enables users to define, create, maintain, and control access to the database.

Database Schema

The description of the database.

Objectives of three level ANSI-SPARC architecture

Separate each user’s view of the database from way that database is physically represented.(还没太理解这句话的意思)