Table: vfl_1981_game_2
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: What was the home team's score when North Melbourne was the away team?
SQL: SELECT "home_team_score" FROM vfl_1981_game_2 WHERE "away_team" = 'north melbourne'

Question: What was the date of the game when the home team scored 21.18 (144) and the away team scored 16.19 (115)?
SQL: SELECT "date" FROM vfl_1981_game_2 WHERE "home_team_score" = '21.18 (144)' AND "away_team_score" = '16.19 (115)'

Question: Who was the away team when Geelong was the home team?
SQL: SELECT "away_team" FROM vfl_1981_game_2 WHERE "home_team" = 'geelong'