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MCQ (Single Correct Answer)
GATE CSE 2000
Given the relations
employee (name, salary, deptno), anddepartment (deptno, deptname, address)
Which of the following queries cannot be expressed using the basic relational algebra operations (σ,π,×,⋈,∪,∩,−)?
A) Department address of every employee
B) Employees whose name is the same as their department name
C) The sum of all employee’s salaries
D) All employees of a given department
