What is the date of completion of the course named "machine learning"?
select t2.date_of_completion from courses as t1 join student_course_enrolment as t2 on t1.course_id = t2.course_id where t1.course_name = "machine learning"
What is the date of enrollment of that course?
select t2.date_of_enrolment from courses as t1 join student_course_enrolment as t2 on t1.course_id = t2.course_id where t1.course_name = "machine learning"
So what is the date of enrollment of the course named "Spanish"?
select t2.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"