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Chiichen committed Oct 30, 2023
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# This control sidebar order
order: 1
author: ChiChen
date: 2023/10/30
date: 2023-10-30
category:
- 笔记
- Linux 内核
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12 changes: 6 additions & 6 deletions src/posts/数据库/Chapter1 Introduction.md
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# This control sidebar order
order: 1
author: ChiChen
date: 2023/10/30
date: 2023-10-30
category:
- 笔记
tag:
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应用程序隐藏数据类型的详细信息。 出于安全目的,视图还可以隐藏信息(例如员工的工资)。

![视图层](image/Pasted%20image%2020231030152526.png)
![视图层](image/20231030152526.png)

## Instances and Schemas

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- 实体:企业中区别于其他对象的“事物”或“对象” 由一组属性描述
- 关系:多个实体之间的关联 用实体关系图来形象地表示:
![实体关系图](image/Pasted%20image%2020231030170439.png)
![实体关系图](image/20231030170439.png)
## Storage Management
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2. 优化
3. 执行
![Query Processing](image/Pasted%20image%2020231030170724.png)
![Query Processing](image/20231030170724.png)
- 评估给定查询的替代方法
- 等价表达式
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## 数据库用户和管理员
![数据库用户和管理员](image/Pasted%20image%2020231030172452.png)
![数据库用户和管理员](image/20231030172452.png)
## 数据库内部一览
![数据库内部一览](image/Pasted%20image%2020231030172520.png)
![数据库内部一览](image/20231030172520.png)
## 数据库架构
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