Question

R(StudentID, CourseI

  • D records every course each student has taken. S(CourseI
  • D lists all courses required for a certain certification. Which relational algebra operation returns exactly the StudentIDs of students who have taken every course listed in S?
A R ⋈ S (Natural Join)
B R ∪ S (Union)
C R − S (Set Difference)
D πStudentID(R) (Projection)
E R ÷ S (Division)
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