CREATE TABLE table_200_33 (id NUMBER, "district" CLOB, "area size\ ( km2 ) " CLOB, "population" CLOB, "density\ per km2" NUMBER)

which district has the highest population density ?
SELECT "district" FROM table_200_33 ORDER BY "density\nper km2" DESC LIMIT 1
SELECT "district" FROM "table_200_33" ORDER BY "density\nper km2" DESC FETCH FIRST 1 ROWS ONLY