BEGIN
  UPDATE artists
  SET total_plays = total_plays - 1
  WHERE name_string = OLD.artist_name;

  UPDATE albums
  SET total_plays = total_plays - 1
  WHERE name = OLD.album_name
    AND artist_name = OLD.artist_name;

  UPDATE genres
  SET total_plays = total_plays - 1
  WHERE id = (
    SELECT genres
    FROM artists
    WHERE name_string = OLD.artist_name
  );

  RETURN OLD;
END;