UPDATE courses SET discipline = null WHERE id_course = 'course24';
UPDATE courses SET discipline = null WHERE id_course = 'course39';
UPDATE courses SET discipline = null WHERE id_course = 'course115';
UPDATE courses SET discipline = null WHERE id_course = 'course159';
UPDATE courses SET discipline = null WHERE id_course = 'course124';
UPDATE courses SET discipline = null WHERE id_course = 'course129';
UPDATE courses SET discipline = null WHERE id_course = 'course23';
UPDATE courses SET discipline = null WHERE id_course = 'course8';
UPDATE courses SET discipline = null WHERE id_course = 'course104';
UPDATE courses SET discipline = null WHERE id_course = 'course126';
UPDATE courses SET discipline = null WHERE id_course = 'course91';
