Table: bulls_game_stats_19
Columns: date
opponent
score
record
streak

Question: who is the opponent on february 8, 1990?
SQL: SELECT "opponent" FROM bulls_game_stats_19 WHERE "date" = 'february 8, 1990'

Question: who is the opponent when the streak is won 9 on april 13, 1990?
SQL: SELECT "opponent" FROM bulls_game_stats_19 WHERE "streak" = 'won 9' AND "date" = 'april 13, 1990'