Table: nfl_game_data
Columns: week
date
opponent
result
game_site
attendance

Question: Who is the opponent after week 9 at rich stadium?
SQL: SELECT "opponent" FROM nfl_game_data WHERE "week" > 9 AND "game_site" = 'rich stadium'

Question: What was the attendance on 1997-12-14?
SQL: SELECT "attendance" FROM nfl_game_data WHERE "date" = '1997-12-14'