What are the names of all directors whose movies have been reviewed by Sarah Martinez?
SELECT DISTINCT T2.director FROM Rating AS T1 JOIN Movie AS T2 ON T1.mID  =  T2.mID JOIN Reviewer AS T3 ON T1.rID  =  T3.rID WHERE T3.name  =  'Sarah Martinez'
names of all directors = SELECT DISTINCT director_name; movies have been reviewed by Sarah Martinez refers to joining tables between Movies, Ratings, and Reviewers where reviewer's name = 'Sarah Martinez';