Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Reviewer ( rID int, name text )
TABLE: CREATE TABLE Rating ( rID int, mID int, stars int, ratingDate date )
TABLE: CREATE TABLE Movie ( mID int, title text, year int, director text )

### Question ###
For each director, return the director's name together with the highest rating among all of their movies and ignore movies whose director is NULL Could you plot the result with a bar chart?, list by the x-axis in descending please.

### Accurate SQL ###

SELECT director, MAX(T1.stars) FROM Rating AS T1 JOIN Movie AS T2 ON T1.mID = T2.mID WHERE director <> "null" GROUP BY director ORDER BY director DESC