Question: Write a relational - algebra expression to retrieve all information about students and ratings, including the students who rated a professor with a score less

Write a relational-algebra expression to retrieve all information about students
and ratings, including the students who rated a professor with a score less than
or equal to fiveTable: Professor
PK: PID
Table: Rating
PK: SID + PID
FK: SID, PID
Table: Student
PK: SID
Write a relational-algebra expression to retrieve all information about students and

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