MySQL DATABASE - SQL 语句使用第三个表连接两个表

Question

I am a little confused with this question. it asks for the following: "Create a single SQL statement that will display all columns from the student and professor tables. You will need to use the student_professor table to set up the joins."

Normally this wouldnt be difficult under the circumstances of just having 2 tables using a related column, but this is asking me to use a 3rd table?

These are the tables

professor , student , student_professor

Columns for 'professor'

ProfessorId , ProfessorProgram , PhoneNo , Age , ProfessorName

Columns for 'student'

studentno , studentprogram , phoneno , age , firstname , lastname

Columns for 'student_professor'

student_professor_id , ProfessorId , StudentNo , Mentor

Answer 1

Not tested, but this should get you started:

SELECT s.*, p.*
FROM professor p, student s, student_professor sp
WHERE sp.professorId = p.proffesorId
AND   sp.studentNo = s.studentNo
ORDER BY p.ProfessorName, s.lastname, s.firstname

or

SELECT s.*, p.*
FROM professor p
JOIN student_professor sp ON sp.professorId = p.proffesorId
JOIN student s ON sp.studentNo = s.studentNo
ORDER BY p.ProfessorName, s.lastname, s.firstname