SELECT director, MIN(T1.stars) FROM Rating AS T1 JOIN Movie AS T2 ON T1.mID = T2.mID GROUP BY director ORDER BY director DESC
Please visualize a bar chart, that the X-axis is the director and the Y-axis is thier corresponding lowest rating among all movies, and order x-axis from high to low order.
CREATE TABLE Rating (
    rID int,
    mID int,
    stars int,
    ratingDate date
)

CREATE TABLE Movie (
    mID int,
    title text,
    year int,
    director text
)

CREATE TABLE Reviewer (
    rID int,
    name text
)