instruction: Return the completion date for all the tests that have 'Fail' result, and count them by a bar chart, and could you list by the total number from low to high please?
response: SELECT date_of_completion, COUNT(date_of_completion) FROM Student_Course_Enrolment AS T1 JOIN Student_Tests_Taken AS T2 ON T1.registration_id = T2.registration_id WHERE T2.test_result = "Fail" ORDER BY COUNT(date_of_completion)