GATE | GATE CS 2021 | Set 1 | Question 37

The following relation records the age of 500 employees of a company, where empNo ( indicating the employee number) is the key:

Consider the following relational algebra expression:

What does the above expression generate?
(A) Employee numbers of only those employees whose age is the maximum
(B) Employee numbers of only those employees whose age is more than the age of exactly one other employee
(C) Employee numbers of all employees whose age is not the minimum
(D) Employee numbers of all employees whose age is the minimum


Answer: (C)

Explanation: In the given query, conditional join is applied between the two relations.

We have a condition in the conditional join that if the age of the employee is greater than age of the any other employee, it will print the empno of that employee.

So above query will print the empno of all the employees whose age is not minimum.

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