user: Question: What was the date of the Friendly competition with a score of 4-0?
Columns: ['Date', 'Venue', 'Score', 'Result', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['October 21, 2001', 'Manama , Bahrain', '3-1', 'Won', '2002 FIFA World Cup qualification']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Competition" = 'Friendly' AND "Score" = '4-0';