Database Design Basics (ER Diagrams)

Summary

Understanding how tables relate through primary and foreign keys, visualized in an Entity-Relationship diagram — enough to navigate an unfamiliar schema quickly.

How to Learn This

1Sketch an ER diagram for a simple e-commerce database (users, orders, products).
2Learn to identify primary keys and foreign keys in an unfamiliar schema.
3Practice reading a real company's (public or sample) schema documentation.

Query Optimization Basics

Write 20 SQL Queries Against a Sample Database

More topics in SQL for Data Analysis

SQL Basics (SELECT, WHERE, ORDER BY)Aggregate Functions (COUNT, SUM, AVG)GROUP BY & HAVING Joins (INNER, LEFT, RIGHT, FULL)Subqueries Common Table Expressions (CTEs)Window Functions Date & String Functions Query Optimization Basics

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