CREATE TABLE product (product_id NUMBER, product CLOB, dimensions CLOB, dpi NUMBER, pages_per_minute_color NUMBER, max_page_size CLOB, interface CLOB)
CREATE TABLE store (store_id NUMBER, store_name CLOB, type CLOB, area_size NUMBER, number_of_product_category NUMBER, ranking NUMBER)
CREATE TABLE district (district_id NUMBER, district_name CLOB, headquartered_city CLOB, city_population NUMBER, city_area NUMBER)
CREATE TABLE store_product (store_id NUMBER, product_id NUMBER)
CREATE TABLE store_district (store_id NUMBER, district_id NUMBER)

What is the most common maximum page size?
SELECT max_page_size FROM product GROUP BY max_page_size ORDER BY COUNT(*) DESC LIMIT 1
SELECT "max_page_size" FROM "product" GROUP BY "max_page_size" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY