Consider the following relational schema: Student (sid, sname, dept) Enroll (cid, sid, grade, semester) Course (cid, cname, dept, credit) Prereq (cid, pid) Write the following queries in Relational Algebra expression: a) For students who have received an A in a course, return name of students and title of the course. b) Find name and id of students taken at least one of the prerequisite of CS595 course and got an A grade in this prerequisite course.

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