Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_2019 ( "Fiscal year" real, "2-car sets" real, "4-car sets" real, "6-car sets" real, "8-car sets" real, "Total vehicles" real )

### Question ###
What is the smallest 8-car sets if 4-car sets is 47?

### Accurate SQL ###

SELECT MIN("8-car sets") FROM table_2019 WHERE "4-car sets" = '47'