What is the average Bronze, when Silver is 0, when Rank is 19, and when Total is greater than 2?
CREATE TABLE "medal_table" (
  "rank" text,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT AVG("bronze") FROM "medal_table" WHERE "silver"=0 AND "rank"='19' AND "total">2;