CREATE TABLE table_204_261 (id NUMBER, "rank" NUMBER, "nation" CLOB, "gold" NUMBER, "silver" NUMBER, "bronze" NUMBER, "total" NUMBER)

how many nations ranked in last with 0 total medals ?
SELECT COUNT("nation") FROM table_204_261 WHERE "total" = 0
SELECT COUNT("nation") FROM "table_204_261" WHERE "total" = 0