CREATE TABLE "round_18" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: What venue did Richmond play as the away team?
SQL: SELECT "venue" FROM "round_18" WHERE "away_team"='richmond';

Question: What is the team of Essendon's score in the game where they were the home team?
SQL: SELECT "home_team_score" FROM "round_18" WHERE "home_team"='essendon';