Master SQL for Data Analysis - Relational Model, ER Diagram

The video tutorial explains the structure of relational databases, focusing on columns, rows, primary and foreign keys. It introduces the relational model's building blocks: entities, attributes, and relationships, and discusses entity relationship diagrams (ERDs) as tools for illustrating database structures. The tutorial emphasizes using ERDs to optimize queries by understanding entity connections and available attributes.

Describe the types of relationships that can exist between entities in a relational database.

What is an Entity Relationship Diagram (ERD) and how is it used?