CREATE TABLE "round_15" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: What was St Kilda's away team score?
SQL: SELECT "away_team_score" FROM "round_15" WHERE "away_team"='st kilda';

Question: Who was home team South Melbourne's opponent?
SQL: SELECT "away_team" FROM "round_15" WHERE "home_team"='south melbourne';