What is the total number of bronze medals for the team with more than 4 silver and less than 30 gold medals?
CREATE TABLE "world_championships_total_medals" (
  "rank" text,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT COUNT("bronze") FROM "world_championships_total_medals" WHERE "silver">4 AND "nation"='total' AND "gold"<30;