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

which code is above cl
SELECT "code" FROM table_204_579 WHERE id = (SELECT id FROM table_204_579 WHERE "code" = 'cl') - 1
SELECT "code" FROM "table_204_579" WHERE "id" = (SELECT "id" FROM "table_204_579" WHERE "code" = 'cl') - 1