user: Question: How many years was the opponent petr korda?
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Opponent', 'Score']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 1996.0, 'Rome', 'Clay', 'Thomas Muster', '2–6, 4–6, 6–3, 3–6']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "Opponent" = 'petr korda';