Table: nhl_game_stats_0809
Columns: date
visitor
score
home
decision
attendance
record

Question: Who was the visitor on April 2?
SQL: SELECT "visitor" FROM nhl_game_stats_0809 WHERE "date" = 'april 2'

Question: What was the maximum attendance when Chicago is the visiting team?
SQL: SELECT MAX("attendance") FROM nhl_game_stats_0809 WHERE "visitor" = 'chicago'