UPDATE courses SET discipline = null WHERE id_course = 'course134';
UPDATE courses SET discipline = null WHERE id_course = 'course16';
UPDATE courses SET discipline = null WHERE id_course = 'course64';
UPDATE courses SET discipline = null WHERE id_course = 'course101';
UPDATE courses SET discipline = null WHERE id_course = 'course136';
UPDATE courses SET discipline = null WHERE id_course = 'course51';
UPDATE courses SET discipline = null WHERE id_course = 'course151';
UPDATE courses SET discipline = null WHERE id_course = 'course34';
UPDATE courses SET discipline = null WHERE id_course = 'course75';
UPDATE courses SET discipline = null WHERE id_course = 'course121';
UPDATE courses SET discipline = null WHERE id_course = 'course126';
UPDATE courses SET discipline = null WHERE id_course = 'course77';
