queries in relational algebra

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Consider the following student database:
Student(ID, Name, Address, City, Tutor)
Enrolment(ID, Code, Marks)
Course(Code, Title, Department)
Formulate the following queries in relational algebra using the student database above. Assume that the attribute Tutor is the ID of the tutor.
(a) List all the student names.
(b) List all school and course names.
(c) Find student names of students that have no tutor.
(d) Find student names of students that are doing computer science courses.
(e) Find student names of students that have Suresh Chandra as tutor.

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