CREATE TABLE table_name_74 (year_of_disaffiliation NUMBER, city_of_license_market VARCHAR2)

What is the earliest year of disaffiliation of a CHCH-TV station, licensed in Hamilton, Ontario?
SELECT MIN(year_of_disaffiliation) FROM table_name_74 WHERE city_of_license_market = "hamilton, ontario"
SELECT MIN("year_of_disaffiliation") FROM "table_name_74" WHERE "city_of_license_market" = "hamilton, ontario"