What are One-to-One Relationships in ER Diagrams? (With Real-World Examples)

*Summary*

What does it mean when two entities in a database are linked one-to-one? In this video, we introduce the concept of cardinality in ER diagrams, focusing on two essential aspects: direction and representation. You'll learn:

* What cardinality means in entity-relationship modeling
* How to interpret and represent one-to-one relationships
* How directionality affects the meaning of relationships
* Common notations used to express cardinality in ER diagrams

Whether you're new to database design or brushing up on the fundamentals, this video will give you a solid foundation for understanding how relationships are modeled in ER diagrams.

Want to go deeper? Check out the book Grokking Relational Database Design: https://mng.bz/PRER.

*Timestamps*

00:00 Introduction
00:21 Cardinality explained
07:21 One-to-one relationships
15:12 Summary

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Видео What are One-to-One Relationships in ER Diagrams? (With Real-World Examples) канала StructuredCS