🔑 What Is a Composite Key? A composite key is a primary key made up of two or more columns that together uniquely identify a row in a table. Use a composite key when no single column is unique on its own, but the combination is. 👉 Example: Composite Key in Action Let’s say we’re … Continue reading Setup 🛠 Rails 8 App – Part 13: Composite keys & Candidate keys in Rails DB