Which Country has a Top Team of jam, and an Edition of 31st?
CREATE TABLE "games" (
  "edition" text,
  "year" text,
  "city" text,
  "country" text,
  "date" text,
  "no_of_events" real,
  "top_team" text
);
SELECT "country" FROM "games" WHERE "top_team"='jam' AND "edition"='31st';