CREATE TABLE table_22243 ("Commune" CLOB, "Area  ( km 2  ) " CLOB, "2002 population" FLOAT, "Pop. density  ( km 2  ) " CLOB, "Municipality website" CLOB)

What are the population densities of all communes with an are of 28.3 sq.km.?
SELECT "Pop. density (km 2 )" FROM table_22243 WHERE "Area (km 2 )" = '28.3'
SELECT "Pop. density (km 2 )" FROM "table_22243" WHERE "Area (km 2 )" = '28.3'