What's the episode number of 'Anxiety'?
CREATE TABLE table_643 (
    "Episode #" real,
    "Title" text,
    "Part 1" text,
    "Part 2" text,
    "Part 3" text,
    "Part 4" text,
    "Part 5" text,
    "Part 6" text
)
SELECT "Episode #" FROM table_643 WHERE "Title" = 'Anxiety'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What's the episode number of 'Anxiety'? ### Input: CREATE TABLE table_643 (
    "Episode #" real,
    "Title" text,
    "Part 1" text,
    "Part 2" text,
    "Part 3" text,
    "Part 4" text,
    "Part 5" text,
    "Part 6" text
) ### Response: SELECT "Episode #" FROM table_643 WHERE "Title" = 'Anxiety'