write the equivalent to relational algebra for the following questions.
1) SELECT Ename FROM Employee WHERE Salary > 5000;
2) SELECT * FROM Employee WHERE Salary >5000;
3) SELECT * FROM Countries WHERE C_name='Ethiopia'
4) SELECT currency FROM Countries
5) SELECT * FROM Student) INTERSECT (SELECT * FROM Grade)
6) SELECT * FROM Student) UNION (SELECT * FROM Grade)
7) (SELECT * FROM Student) EXCEPT (SELECT * FROM Grade)
8) SELECT * FROM Student WHERE CGPA = (SELECT MAX(CGPA) FROM Roster);
1) π Ename (σ Salary>5000 (Employee))
2) σ Salary>5000 (Employee)
3) σ C_name='Ethiopia' (Countries)
4) π currency (Countries)
5) Student ⋂ Grade
6) Student ⋃ Grade
7) Student - Grade
8) σ CGPA=(σ MAX(CGPA) (Roster)) (Student)