What is the sum of a rank whose nation is West Germany and has bronze larger than 0?
CREATE TABLE "medal_table" (
  "rank" real,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT SUM("rank") FROM "medal_table" WHERE "nation"='west germany' AND "bronze">0;