instruction: Find the the date of enrollment of the 'Spanish' course, and count them by a bar chart, and order Y-axis in descending order.
response: SELECT date_of_enrolment, COUNT(date_of_enrolment) FROM Courses AS T1 JOIN Student_Course_Enrolment AS T2 ON T1.course_id = T2.course_id WHERE T1.course_name = "Spanish" ORDER BY COUNT(date_of_enrolment) DESC