What is the sum of Maidens with a number of Matches that is 2?
CREATE TABLE "first_class_bowling_statistics" (
  "player" text,
  "matches" real,
  "overs" real,
  "maidens" real,
  "runs" real,
  "wickets" real,
  "average" text,
  "economy" real,
  "best_bowling" text
);
SELECT SUM("maidens") FROM "first_class_bowling_statistics" WHERE "matches"=2;