CREATE TABLE Movie (mID INT, title TEXT, year INT, director TEXT)
CREATE TABLE Rating (rID INT, mID INT, stars INT, ratingDate DATE)
CREATE TABLE Reviewer (rID INT, name TEXT)

Show the director and their lowest rating among all movies in a bar chart, and sort total number from high to low order.
SELECT director, MIN(T1.stars) FROM Rating AS T1 JOIN Movie AS T2 ON T1.mID = T2.mID GROUP BY director ORDER BY MIN(T1.stars) DESC
SELECT "director", MIN("T1"."stars") FROM "Rating" AS "T1" JOIN "Movie" AS "T2" ON "T1"."mID" = "T2"."mID" GROUP BY "director" ORDER BY MIN("T1"."stars") DESC NULLS LAST