user: Question: What is the surface of the French Championships?
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', 1960.0, 'Wimbledon Championships', 'Grass', 'Rafael Osuna', 'Mike Davies Bobby Wilson', '7–5, 6–3, 10–8']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Championship" = 'French Championships';