CREATE TABLE table_203_79 (id DECIMAL, "year" DECIMAL, "film" TEXT, "publisher" TEXT, "director" TEXT, "distributor" TEXT, "worldwide gross" TEXT, "notes" TEXT)

which film made the most worldwide gross income ?
SELECT "film" FROM table_203_79 ORDER BY "worldwide gross" DESC LIMIT 1
SELECT "film" FROM "table_203_79" ORDER BY "worldwide gross" DESC NULLS LAST LIMIT 1