DELETE FROM courses WHERE id_course = 'course32';
DELETE FROM courses WHERE id_course = 'course57';
DELETE FROM courses WHERE id_course = 'course125';
DELETE FROM courses WHERE id_course = 'course157';
DELETE FROM courses WHERE id_course = 'course46';
DELETE FROM courses WHERE id_course = 'course120';
DELETE FROM courses WHERE id_course = 'course20';
DELETE FROM courses WHERE id_course = 'course8';
DELETE FROM courses WHERE id_course = 'course119';
DELETE FROM courses WHERE id_course = 'course144';
DELETE FROM courses WHERE id_course = 'course160';
