CREATE TABLE table_643 ("Episode #" FLOAT, "Title" TEXT, "Part 1" TEXT, "Part 2" TEXT, "Part 3" TEXT, "Part 4" TEXT, "Part 5" TEXT, "Part 6" TEXT)

What's the episode number of 'Anxiety'?
SELECT "Episode #" FROM table_643 WHERE "Title" = 'Anxiety'
SELECT "Episode #" FROM "table_643" WHERE "Title" = 'Anxiety'