CREATE TABLE table_204_155 (id NUMBER, "rank" NUMBER, "heat" NUMBER, "athlete" CLOB, "nationality" CLOB, "time" NUMBER, "notes" CLOB)

who is the only cyclist from brazil ?
SELECT "athlete" FROM table_204_155 WHERE "nationality" = 'brazil'
SELECT "athlete" FROM "table_204_155" WHERE "nationality" = 'brazil'