CREATE TABLE furniture (furniture_id NUMBER, name CLOB, num_of_component NUMBER, market_rate NUMBER)
CREATE TABLE furniture_manufacte (manufacturer_id NUMBER, furniture_id NUMBER, price_in_dollar NUMBER)
CREATE TABLE manufacturer (manufacturer_id NUMBER, open_year NUMBER, name CLOB, num_of_factories NUMBER, num_of_shops NUMBER)

what is the average number of factories and maximum number of shops for manufacturers that opened before 1990.
SELECT MAX(num_of_shops), AVG(num_of_factories) FROM manufacturer WHERE open_year < 1990
SELECT MAX("num_of_shops"), AVG("num_of_factories") FROM "manufacturer" WHERE "open_year" < 1990