CREATE TABLE table_18638067_1 (actor_actress VARCHAR, film_title_used_in_nomination VARCHAR)

In the film Mrs. Miniver, what is the actresses name?
SELECT actor_actress FROM table_18638067_1 WHERE film_title_used_in_nomination = "Mrs. Miniver"
SELECT "actor_actress" FROM "table_18638067_1" WHERE "Mrs. Miniver" = "film_title_used_in_nomination"