Please use SQL to answer queries.

STUDENT(Ssn, Name, Major, Bdate)

COURSE(Course#, Cname, Dept)

ENROLL(Ssn, Course#, Quarter, Grade)

BOOK_ADOPTION(Course#, Quarter, Book_isbn)

TEXT(Book_isbn, Book_title, Publisher, Author)

1.Retrieve the names of courses in which the textbook has been changed at least once.

2.Retrieve the names of departments that adopt textbooks published by Addison-Wesley only.

3. Retrieve the names of students who have never used a book (in a course) written by Navathe and published by Addison-Wesley.