Overview

One-to-many, many-to-many, foreign key constraints, and junction tables.

Key Points

• Study the core concepts before attempting related system design challenges.
• Apply these patterns in practice to build intuition for trade-offs.
• Connect this concept to adjacent topics for a holistic understanding.

When to Apply

Use this concept when designing systems that require the capabilities described above. Consider the trade-offs carefully against simpler alternatives before committing to the added complexity.