CREATE TABLE table_204_579 (id NUMBER, "code" CLOB, "district" CLOB, "headquarters" CLOB, "population  ( as of 2011 ) " NUMBER, "area  ( km2 ) " NUMBER, "density  ( /km2 ) " NUMBER)

what is the last code listed ?
SELECT "code" FROM table_204_579 ORDER BY id DESC LIMIT 1
SELECT "code" FROM "table_204_579" ORDER BY "id" DESC FETCH FIRST 1 ROWS ONLY