Table: vfl_1973_match
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: When the Away team scored 20.15 (135) on the Date of 23 april 1973, how many people were in the crowd?
SQL: SELECT "crowd" FROM vfl_1973_match WHERE "date" = '23 april 1973' AND "away_team_score" = '20.15 (135)'

Question: When the Away team was essendon, what was the Venue they played at?
SQL: SELECT "venue" FROM vfl_1973_match WHERE "away_team" = 'essendon'