user: Question: When is the Competition of Friendly match with a Result of 2–1?
Columns: ['Date', 'Venue', 'Score', 'Result', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['25 September 2003', 'Incheon', '1 goal', '5–0', '2004 AFC Asian Cup qualification']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Competition" = 'Friendly match' AND "Result" = '2–1';