Table: t_1977_vfl_match
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: How many people were in the crowd with the away team being collingwood?
SQL: SELECT COUNT("crowd") FROM t_1977_vfl_match WHERE "away_team" = 'collingwood'

Question: Name the away team for essendon
SQL: SELECT "away_team" FROM t_1977_vfl_match WHERE "home_team" = 'essendon'