UPDATE courses SET discipline = null WHERE id_course = 'course32';
UPDATE courses SET discipline = null WHERE id_course = 'course57';
UPDATE courses SET discipline = null WHERE id_course = 'course125';
UPDATE courses SET discipline = null WHERE id_course = 'course157';
UPDATE courses SET discipline = null WHERE id_course = 'course46';
UPDATE courses SET discipline = null WHERE id_course = 'course120';
UPDATE courses SET discipline = null WHERE id_course = 'course20';
UPDATE courses SET discipline = null WHERE id_course = 'course8';
UPDATE courses SET discipline = null WHERE id_course = 'course119';
UPDATE courses SET discipline = null WHERE id_course = 'course144';
UPDATE courses SET discipline = null WHERE id_course = 'course160';
