Show the studios that have not produced films with director 'Walter Hill'.
CREATE TABLE film_market_estimation (
    estimation_id number,
    low_estimate number,
    high_estimate number,
    film_id number,
    type text,
    market_id number,
    year number
)

CREATE TABLE market (
    market_id number,
    country text,
    number_cities number
)

CREATE TABLE film (
    film_id number,
    title text,
    studio text,
    director text,
    gross_in_dollar number
)
SELECT studio FROM film EXCEPT SELECT studio FROM film WHERE director = "Walter Hill"
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: Show the studios that have not produced films with director 'Walter Hill'. ### Input: CREATE TABLE film_market_estimation (
    estimation_id number,
    low_estimate number,
    high_estimate number,
    film_id number,
    type text,
    market_id number,
    year number
)

CREATE TABLE market (
    market_id number,
    country text,
    number_cities number
)

CREATE TABLE film (
    film_id number,
    title text,
    studio text,
    director text,
    gross_in_dollar number
) ### Response: SELECT studio FROM film EXCEPT SELECT studio FROM film WHERE director = "Walter Hill"