UPDATE courses SET discipline = null WHERE id_course = 'course24';
UPDATE courses SET discipline = null WHERE id_course = 'course52';
UPDATE courses SET discipline = null WHERE id_course = 'course64';
UPDATE courses SET discipline = null WHERE id_course = 'course108';
UPDATE courses SET discipline = null WHERE id_course = 'course115';
UPDATE courses SET discipline = null WHERE id_course = 'course136';
UPDATE courses SET discipline = null WHERE id_course = 'course138';
UPDATE courses SET discipline = null WHERE id_course = 'course172';
UPDATE courses SET discipline = null WHERE id_course = 'course120';
UPDATE courses SET discipline = null WHERE id_course = 'course4';
UPDATE courses SET discipline = null WHERE id_course = 'course8';
UPDATE courses SET discipline = null WHERE id_course = 'course121';
UPDATE courses SET discipline = null WHERE id_course = 'course137';
UPDATE courses SET discipline = null WHERE id_course = 'course77';
