Table: t_1934_vfl_game_4
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: What is the lowest crowd when North Melbourne played at home?
SQL: SELECT MIN("crowd") FROM t_1934_vfl_game_4 WHERE "home_team" = 'north melbourne'

Question: What is the average crowd size where the away team scored 22.12 (144)?
SQL: SELECT AVG("crowd") FROM t_1934_vfl_game_4 WHERE "away_team_score" = '22.12 (144)'