CREATE TABLE table_2019 ("Fiscal year" FLOAT, "2-car sets" FLOAT, "4-car sets" FLOAT, "6-car sets" FLOAT, "8-car sets" FLOAT, "Total vehicles" FLOAT)

What is the smallest 8-car sets if 4-car sets is 47?
SELECT MIN("8-car sets") FROM table_2019 WHERE "4-car sets" = '47'
SELECT MIN("8-car sets") FROM "table_2019" WHERE "4-car sets" = '47'