*) NEED THEORETICAL ANSWER

**) NEED THEORETICAL ANSWER

4. (5) Given the following relation schema and assume that a primary index has been established on DNUMBER, how to evaluate ODNUMBER>5(DEPARTMENT) in an efficient way? Describe your method. DEPARTMENT DNUMBER DNAME 5. (10) Given the following relation schema and assume that two indexes (including record points) have been established over superssn and dno, how to evaluate Odno = 4 superssn = 343488 (Employee) in an efficient way? Describe your method. EMPLOYEE fname, minit, lname, ssn, bdate, address, sex, salary, superssn, dno John B Smith 123489 1965-01-09 731 Fondren M 40000 343488 5 Franklin T Wong 239979 1955-01-10 638 Voss M 50000 343488 5