user: Question: How many teams did they play week 6
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Kickoff [a ]', 'Venue', 'TV', 'Attendance', 'Record']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [1.0, 'September 12', 'Houston Oilers', 'L 0–20', '2:00', 'The Astrodome', 'NBC', 42228.0, '0–1']
SQL:

assistant: SELECT COUNT("Opponent") FROM "Table" WHERE "Week" = 6.0;