Most Polarising Products

The spread of a product is its highest rating minus its lowest rating. Return products with a spread of at least 3, with the spread.

Table schema

Reviews(id INT PRIMARY KEY, product VARCHAR(10), rating INT, review_date DATE)

Sample data

id | product | rating | review_date
1 | Pen | 5 | 2026-01-10
2 | Pen | 5 | 2026-01-20
3 | Book | 2 | 2026-01-15
4 | Book | 5 | 2026-02-01
5 | Bag | 4 | 2026-02-10
6 | Bag | 3 | 2026-02-11
7 | Bag | 4 | 2026-02-12