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)

what city has the least amount of area recorded -lrb- not to include any city with n.a. recorded -rrb- ?
SELECT "sum" FROM table_204_381 ORDER BY "area\nkm2" LIMIT 1
SELECT "sum" FROM "table_204_381" ORDER BY "area\nkm2" NULLS FIRST LIMIT 1