What is the lowest number of Overs for the Royal Challengers Bangalore?
CREATE TABLE "best_economy" (
  "player" text,
  "team" text,
  "matches" real,
  "overs" real,
  "economy_rate" real,
  "wickets" real,
  "average" real,
  "strike_rate" real,
  "best_bowling" text
);
SELECT MIN("overs") FROM "best_economy" WHERE "team"='royal challengers bangalore';