PS5
SELECT
product_name,
list_price,
category_id
FROM
production.products p1
WHERE
list_price IN (
SELECT
MAX (p2.list_price)
FROM
production.products p2
WHERE
p2.category_id = p1.category_id
GROUP BY
p2.category_id
)
ORDER BY
category_id,
product_name;
Graceful Giraffe