CREATE TABLE table_17416221_1 (area__km_2__ INT, largest_city VARCHAR)

what is minimum area where the largest city is bloemfontein?
SELECT MIN(area__km_2__) FROM table_17416221_1 WHERE largest_city = "Bloemfontein"
SELECT MIN("area__km_2__") FROM "table_17416221_1" WHERE "Bloemfontein" = "largest_city"