SQL中的PRIMARY KEY（PK） (主键)和Foreign Key (FK) (外键解析_pk和fk …
2019年10月23日 · 1：ERD (entity relationship dialgram)实体属性图中PK所对应的就是每个表中主键 (上图为ERD) 2：当我们用SQL语言查询表的时候，一般第一个列出的就是每个表的主键
How to represent foreign key in an ER diagram?
2024年6月12日 · How do I show in an the relation between the two tables showing that the Customer ID is the foreign key of Transactions which is the primary key in Customer? I found …
Entity Relationship Diagrams | Mermaid
ER diagrams can be used for various purposes, ranging from abstract logical models devoid of any implementation details, through to physical models of relational database tables. It can be …
什么是实体关系图（ERD）？ - Visual Paradigm
实体关系图也被称为 ERD、ER 图、实体联系模型、实体联系模式图或 ER 模型，是一种用于数据库设计的结构图。 一幅 ERD 包含不同的符号和连接符，用于显示两个重要的資訊： 系统范 …
How to visually depict foreign keys in an ER diagram
One common way to represent foreign keys in an ER diagram is by using crow’s foot notation. In this notation, a foreign key is depicted as a short line with a crow’s foot at the end, which …
Foreign Key (Entity Relationship Diagram) - Software Ideas
2022年2月21日 · A foreign key (abbreviated as FK) is an attribute or a set of attributes within an entity that references the primary key of another entity. A foreign key can be a single attribute …
[DATABASE] 기본키(PK), 외래키(FK) - 벨로그
FK (foreign key:외래키)는 참조하는 테이블과 참조되는 테이블의 관계를 나타낸다. 그림에서 학생-수업 테이블은 학생테이블과 수업테이블의 관계를 1:N 관계로 나타내기위한 테이블이므로 …
ERD（实体关系图）概念了解 - CSDN博客
2022年10月16日 · 实体关系图 (ERD) 是一种 图 表，可让您查看不同实体（例如人员、客户或其他对象）在应用程序或数据库中如何相互关联。 它们是在设计新系统时创建的，以便开发团队 …
Understanding foreign keys in entity relationship diagrams
A Foreign Key Entity Relationship Diagram (ERD) is a visual representation of the relationships between entities in a database. It shows how different tables in a database are connected to …
ERD图 - mtxcat - 博客园
2020年4月13日 · 关键概念：Bridge table—两个实体为多对多关系，不能直接表示，需要通过一张Bridge table来过渡,必定为强关系， Bridge table的两个主键即为关联两表的主键—PK,FK1:。 …