Key vs Non-Key Column Database Indexing

Hussein Nasser breaks down how key columns dictate the sorting and search order in an index, while non-key (included) columns don’t affect that order but can hold extra data right in the index.

By tacking on non-key columns to your index, you can “cover” more queries—eliminating expensive lookups and boosting performance. The video shows when and how to pick those extras for maximum speed.

Watch on YouTube