Primary Key vs Secondary Key – TL;DR

This quick dive unpacks the key differences between a primary key (your table’s unique identifier) and a secondary key (non‐unique lookup field), showing how each choice can seriously affect database performance.

Along the way, Hussein Nasser plugs ways to support his channel—PayPal donations, YouTube memberships, courses and playlists—and even lists all his audio/video gear via handy affiliate links.

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