Deshansh Garg on Instagram: "#### Step 1: Identify the Challenge Uber must locate available drivers near a user in real time — * Across millions of active drivers, * With location updates every few seconds, * And respond in under 200ms globally. Now imagine doing that with a SQL query scanning millions of rows — it’s game over --- #### Step 2: Why a Simple DB Query Fails A regular SQL query like: ```sql SELECT * FROM drivers WHERE distance(user_loc, driver_loc)