Test on Oracle DB and another one (e.g. PostgreSQL) Log in as admin Create two new users Create course Enrol both users as students Add a Feedback activity to the course Press Edit questions > Add question > Short text answer Question: Q1 Label: Short text Press Add question > Multiple choice Question: Q2 Label: Multi choice Multiple choice values: Cat Dog Log out Log in as first user Navigate to Feedback activity in course Press Answer the questions Q1: Apples Q2: Dog Submit, then log out Log in as second user Navigate to Feedback activity in course Press Answer the questions Q1: Bananas Q2: Cat Submit, then log out Log in as admin Navigate to Feedback activity in course Press Responses Sort by Q1 and Q2 table columns Confirm they sort both ascending and descending without producing exceptions