CREATE TABLE product (product VARCHAR, max_page_size VARCHAR)

Find the name of the products that are not using the most frequently-used max page size.
SELECT product FROM product WHERE product <> (SELECT max_page_size FROM product GROUP BY max_page_size ORDER BY COUNT(*) DESC LIMIT 1)
SELECT "product" FROM "product" WHERE "product" <> (SELECT "max_page_size" FROM "product" GROUP BY "max_page_size" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1)