Table: t_1979_vfl_match_5
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: What is the smallest crowd of the away team that scored 12.9 (81)?
SQL: SELECT MIN("crowd") FROM t_1979_vfl_match_5 WHERE "away_team_score" = '12.9 (81)'

Question: What away team played in Lake Oval?
SQL: SELECT "away_team" FROM t_1979_vfl_match_5 WHERE "venue" = 'lake oval'