CREATE TABLE "round_16" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: When the Venue was mcg what was the sum of all Crowds for that venue?
SQL: SELECT SUM("crowd") FROM "round_16" WHERE "venue"='mcg';

Question: If the Away team is essendon, what was the Date they played?
SQL: SELECT "date" FROM "round_16" WHERE "away_team"='essendon';

Question: On what Date did the Away team essendon play?
SQL: SELECT "date" FROM "round_16" WHERE "away_team"='essendon';

Question: When the Home team was north melbourne what was the Date of the game?
SQL: SELECT "date" FROM "round_16" WHERE "home_team"='north melbourne';