Table: tennessee_titans_2008
Columns: week
date
opponent
result
game_site
record

Question: What was the earliest week the Titans played at Ford Field?
SQL: SELECT MIN("week") FROM tennessee_titans_2008 WHERE "game_site" = 'ford field'

Question: When did the Titans play the Houston Texans at LP Field before Week 13?
SQL: SELECT "date" FROM tennessee_titans_2008 WHERE "week" < 13 AND "game_site" = 'lp field' AND "opponent" = 'houston texans'