what is the least silver when bronze is 1, rank is less than 2 and gold is more than 4?
CREATE TABLE "medal_table" (
  "rank" real,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT MIN("silver") FROM "medal_table" WHERE "bronze"=1 AND "rank"<2 AND "gold">4;