Table: t_1939_vfl_match_4
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: what was the venue that hosted Carlton as the away team?
SQL: SELECT "venue" FROM t_1939_vfl_match_4 WHERE "away_team" = 'carlton'

Question: What was the date of the Collingwood away game?
SQL: SELECT "date" FROM t_1939_vfl_match_4 WHERE "away_team" = 'collingwood'