CREATE TABLE "round_20" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: What was the attendance of the North Melbourne's home game?
SQL: SELECT COUNT("crowd") FROM "round_20" WHERE "home_team"='north melbourne';

Question: What was the attendance at the Fitzroy home game?
SQL: SELECT SUM("crowd") FROM "round_20" WHERE "home_team"='fitzroy';

Question: What was Richmond's highest attendance?
SQL: SELECT MAX("crowd") FROM "round_20" WHERE "home_team"='richmond';