user: Question: What is every surface against Sweden?
Columns: ['Edition', 'Round', 'Date', 'Against', 'Surface', 'Opponent', 'Win/Lose', 'Result']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2009 World Group Play-offs', 'PO', '18–20 September 2011', 'Sweden', 'Hard (i)', 'Andreas Vinciguerra', 'Win', '4–6 ret.']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Against" = 'Sweden';