WARNING: We will be doing some database manipulation to setup the issue observed, which will break the quizzes in the course used. Use a new course, or better yet, a Moodle install you can just nuke when done. Create a new course Note the id of the course Create a quiz and add a question to it Run the following SQL, but replace COURSEID with the id you noted above 3.11: UPDATE mdl_quiz_slots qs SET questionid = 0 WHERE qs.quizid IN ( SELECT id FROM mdl_quiz q WHERE q.course = COURSEID) 4.0: UPDATE mdl_question_versions SET questionid = 0 WHERE id IN ( SELECT qv.id FROM mdl_quiz q JOIN mdl_quiz_slots qs ON qs.quizid = q.id JOIN mdl_question_references qr ON qr.itemid = qs.id JOIN mdl_question_bank_entries qbe ON qbe.id = qr.questionbankentryid JOIN mdl_question_versions qv ON qv.questionbankentryid = qbe.id WHERE q.course = COURSEID ) Now back in Moodle, in any course, create a question in the question bank Attempt to delete it Confirm the question has been deleted