How many silver medals did spain have when they had more than 0 bronze medals and less than 54 total medals?
CREATE TABLE "medals_table" (
  "rank" text,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT "silver" FROM "medals_table" WHERE "bronze">0 AND "total"<54 AND "nation"='spain';