ศาสตราจารย์คนใดในฤดูหนาวหน้าจะสอนชั้นเรียน PreMajor ?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What professor next Winter is teaching the PreMajor classes ?It is not neccessary to use all the tables.
 course:  course_id [ int]  name [ varchar]  department [ varchar]  number [ varchar]  credits [ varchar]  advisory_requirement [ varchar]  enforced_requirement [ varchar]  description [ varchar]  num_semesters [ int]  num_enrolled [ int]  has_discussion [ varchar]  has_lab [ varchar]  has_projects [ varchar]  has_exams [ varchar]  num_reviews [ int]  clarity_score [ int]  easiness_score [ int]  helpfulness_score [ int] 
SELECT DISTINCT instructor.name FROM course INNER JOIN course_offering ON course.course_id = course_offering.course_id INNER JOIN semester ON semester.semester_id = course_offering.semester INNER JOIN program_course ON program_course.course_id = course_offering.course_id INNER JOIN offering_instructor ON offering_instructor.offering_id = course_offering.offering_id INNER JOIN instructor ON offering_instructor.instructor_id = instructor.instructor_id WHERE program_course.category LIKE '%PreMajor%' AND semester.semester = 'Winter' AND semester.year = 2017