user: Question: What was the week number when they played on dec. 19?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Record', 'Streak', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'Sept. 19', 'vs. Dallas Cowboys', 'Loss 49-37', '0-1', 'L1', 46206.0]
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Date" = 'dec. 19';