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SQL & Databases

Database Foundations4

SQL Fundamentals5

Joins & Aggregation5

Design & Normalization4

ER modeling: designing tables before you build them
Functional dependencies and normalization (1NF-3NF)
Indexes: how databases actually find things fast
Constraints and data integrity in depth

Transactions & Performance4

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

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SQL & Databases

Database Foundations4

SQL Fundamentals5

Joins & Aggregation5

Design & Normalization4

ER modeling: designing tables before you build them
Functional dependencies and normalization (1NF-3NF)
Indexes: how databases actually find things fast
Constraints and data integrity in depth

Transactions & Performance4

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Advanced SQL Toolkit5

Learn SQL & Databases Design & Normalization

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Functional dependencies and normalization (1NF-3NF)

The precise, mathematical reason certain table designs cause update anomalies, and the normal forms that systematically fix them.

13 min readUpdated 2026-09-04database-designnormalizationfunctional-dependencies