CREATE TABLE table_204_381 (id DECIMAL, "sum" DECIMAL, "mongolian" DECIMAL, "population\ ( 2005 ) " DECIMAL, "population\ ( 2008 ) " DECIMAL, "population\ ( 2009 ) " DECIMAL, "area\ km2" DECIMAL, "density\ /km2" DECIMAL, "sum centre\ population" DECIMAL)

which sum is the only one listed with out an area or density given ?
SELECT "sum" FROM table_204_381 WHERE "area\nkm2" IS NULL AND "density\n/km2" IS NULL
SELECT "sum" FROM "table_204_381" WHERE "area\nkm2" IS NULL AND "density\n/km2" IS NULL