instruction: A bar chart for finding the number of the dates of assessment notes for students with first name 'Fanny', and sort Y-axis in descending order.
response: SELECT date_of_notes, COUNT(date_of_notes) FROM Assessment_Notes AS T1 JOIN Students AS T2 ON T1.student_id = T2.student_id WHERE T2.first_name = "Fanny" ORDER BY COUNT(date_of_notes) DESC