user: Question: How many opponents were there when the record was 6-0?
Columns: ['Game', 'Date', 'Opponent', 'Result', 'Cowboys points', 'Opponents', 'Record']
Types: ['real', 'text', 'text', 'text', 'real', 'real', 'text']
Sample row: [1.0, 'Sept. 16', '@ Arizona', 'Win', 36.0, 17.0, '1-0']
SQL:

assistant: SELECT COUNT("Opponent") FROM "Table" WHERE "Record" = '6-0';