Given : LIKE(person, course), TAKING(person, course), and DISLIKE(person, course). Also assume that a person likes at least one course and dislike at least one course as well. We also assume that a course is taken by at least one person.
List the people that are taking all the courses they like. Express in relational algebra.
I've spent a long time looking at this problem and cannot figure it out. I realize if there was one person, I can easily find most questions that ask "all" but in this case, I cannot figure it out because it is more than one person.