Table: vfl_1980_game_4
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: On what date did the match at Lake Oval take place?
SQL: SELECT "date" FROM vfl_1980_game_4 WHERE "venue" = 'lake oval'

Question: What wa the date of the North Melbourne home game?
SQL: SELECT "date" FROM vfl_1980_game_4 WHERE "home_team" = 'north melbourne'

Question: What was the lowest crowd size at MCG?
SQL: SELECT MIN("crowd") FROM vfl_1980_game_4 WHERE "venue" = 'mcg'