user: Question: Where is Riverfront Stadium the game site for the week?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Record', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 6', 'Oakland Raiders', 'W 9–7', 'Mile High Stadium', '1–0', 74796.0]
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Game site" = 'Riverfront Stadium';