user: Question: Name the least 10,000+ places for Louisville
Columns: ['Rank', 'Metropolitan area', 'Principal city', '10,000+ places', 'Densest incorporated place', 'Density']
Types: ['real', 'text', 'text', 'real', 'text', 'text']
Sample row: [1.0, 'New York metropolitan area', 'New York City', 55.0, 'Guttenberg', '56012.0']
SQL:

assistant: SELECT MIN("10,000+ places") FROM "Table" WHERE "Principal city" = 'Louisville';