user: Question: What is the surface of the Palermo, Italy championship?
Columns: ['Outcome', 'Date', 'Championship', 'Surface', 'Opponent in the final', 'Score in the final']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', '30 August 1993', 'Umag , Croatia', 'Clay', 'Thomas Muster', '5–7, 6–3, 3–6']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Championship" = 'Palermo, Italy';