CREATE TABLE table_203_222 (id DECIMAL, "category" TEXT, "#" DECIMAL, "name" TEXT, "hanzi" TEXT, "hanyu pinyin" TEXT, "population  ( 2010 census ) " DECIMAL, "area  ( km2 ) " DECIMAL, "density  ( /km2 ) " DECIMAL)

what city proper has the smallest area in km2 ?
SELECT "name" FROM table_203_222 WHERE "category" = 'city proper' ORDER BY "area (km2)" LIMIT 1
SELECT "name" FROM "table_203_222" WHERE "category" = 'city proper' ORDER BY "area (km2)" NULLS FIRST LIMIT 1