user: Question: What is the average First Downs for December 4?
Columns: ['Week', 'Date', 'Result', 'Record', 'Opponent', 'Points For', 'Points Against', 'First Downs', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'September 18', 'Win', '1–0', 'at Minnesota Vikings', 16.0, 10.0, 16.0, 47678.0]
SQL:

assistant: SELECT AVG("First Downs") FROM "Table" WHERE "Date" = 'December 4';