Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE courses (course_id VARCHAR); CREATE TABLE student_course_attendance (course_id VARCHAR, student_id VARCHAR)
### Question:
How many courses do the student whose id is 171 attend?
### Answer:
SELECT COUNT(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T2.student_id = 171