lab 5 功能有限定，实现无限定。web or terminal都行。

E-R model，relation schema

Simple Notes, prefer dirty work

Chap 6 E-R model

Entity Sets

entity:

Relationship set

Degree of the Relationship set Mapping Cardinalities

Keys

E-R Diagrams

![[Pasted image 20260331111234.png]]

Design of