What is the average number of gold medals the netherlands got when they had more than 4 bronze medals?
CREATE TABLE "medal_table" (
  "rank" real,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT AVG("gold") FROM "medal_table" WHERE "nation"='netherlands' AND "bronze">4;