UPDATE courses SET discipline = null WHERE id_course = 'course134';
UPDATE courses SET discipline = null WHERE id_course = 'course143';
UPDATE courses SET discipline = null WHERE id_course = 'course79';
UPDATE courses SET discipline = null WHERE id_course = 'course89';
UPDATE courses SET discipline = null WHERE id_course = 'course51';
UPDATE courses SET discipline = null WHERE id_course = 'course166';
UPDATE courses SET discipline = null WHERE id_course = 'course38';
UPDATE courses SET discipline = null WHERE id_course = 'course80';
UPDATE courses SET discipline = null WHERE id_course = 'course144';
UPDATE courses SET discipline = null WHERE id_course = 'course147';
