text: DROP TABLE IF EXISTS movie_cast CASCADE;
  CREATE TABLE movie_cast ( -- actor table
      movie_id int,
      staff_id int,
      role text NOT NULL,
  	ordr int,
      PRIMARY KEY (movie_id, staff_id, role, ordr),
      FOREIGN KEY (movie_id) REFERENCES movie(movie_id),
      FOREIGN KEY (staff_id) REFERENCES staff(staff_id)
  );
  COPY movie_cast FROM '/home/zhuzilin/Documents/w4111/tiny-douban/origin_data/movie_cast.csv' DELIMITERS ',' CSV HEADER;
  SELECT COUNT(*)
  FROM movie_cast;