UPDATE courses SET discipline = null WHERE id_course = 'course128';
UPDATE courses SET discipline = null WHERE id_course = 'course158';
UPDATE courses SET discipline = null WHERE id_course = 'course0';
UPDATE courses SET discipline = null WHERE id_course = 'course28';
UPDATE courses SET discipline = null WHERE id_course = 'course49';
UPDATE courses SET discipline = null WHERE id_course = 'course166';
UPDATE courses SET discipline = null WHERE id_course = 'course45';
UPDATE courses SET discipline = null WHERE id_course = 'course149';
UPDATE courses SET discipline = null WHERE id_course = 'course40';
