Table: t_1938_vfl_match_4
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: Which home team has an Away team score of 18.21 (129)?
SQL: SELECT "home_team" FROM t_1938_vfl_match_4 WHERE "away_team_score" = '18.21 (129)'

Question: What is the home team score at windy hill?
SQL: SELECT "home_team_score" FROM t_1938_vfl_match_4 WHERE "venue" = 'windy hill'

Question: What is the largest crowd for an Away team of st kilda?
SQL: SELECT MAX("crowd") FROM t_1938_vfl_match_4 WHERE "away_team" = 'st kilda'