CREATE TABLE store_district (store_id NUMBER, district_id NUMBER)
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 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 (store_id NUMBER, store_name CLOB, type CLOB, area_size NUMBER, number_of_product_category NUMBER, ranking NUMBER)

Which district has the largest population?
SELECT district_name FROM district ORDER BY city_population DESC LIMIT 1
SELECT "district_name" FROM "district" ORDER BY "city_population" DESC FETCH FIRST 1 ROWS ONLY