Table: lions_2004
Columns: week
date
opponent
result
attendance

Question: Which attendance number was taken on november 21, 2004?
SQL: SELECT "attendance" FROM lions_2004 WHERE "date" = 'november 21, 2004'

Question: Which attendance number was taken in a week less than 16 when the Washington Redskins were the opponents?
SQL: SELECT "attendance" FROM lions_2004 WHERE "week" < 16 AND "opponent" = 'washington redskins'

Question: How many weeks had the Green Bay packers as opponents?
SQL: SELECT SUM("week") FROM lions_2004 WHERE "opponent" = 'green bay packers'