CREATE TABLE table_name_45 (episode VARCHAR2, air_date VARCHAR2, viewers VARCHAR2)

What is the episode name that aired on July 23, 2009 with more than 3.31 viewers?
SELECT episode FROM table_name_45 WHERE air_date = "july 23, 2009" AND viewers > 3.31
SELECT "episode" FROM "table_name_45" WHERE "air_date" = "july 23, 2009" AND "viewers" > 3.31