user: Question: How many opponents were there for the game recorded as 6-4 in the Atlanta Falcons 1978 season?
Columns: ['Game', 'Date', 'Opponent', 'Result', 'Falcons points', 'Opponents', 'Record', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real', 'real', 'text', 'real']
Sample row: [1.0, 'Sept. 3', 'Houston Oilers', 'Win', 20.0, 14.0, '1-0', 57328.0]
SQL:

assistant: SELECT COUNT("Opponents") FROM "Table" WHERE "Record" = '6-4';