Q27

MCQ2 marks, −0.67

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

empAge(\underline{empNo},age)

Consider the following relational algebra expression:

\Pi_{empNo}(empAge \Join_{(age>age1)} \rho_{empNo1,age1}(empAge))

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

Loading…