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Question ID 8108

Which SELECT statement displays employee names, salary, department numbers and average salaries for all employees who earn more than the average salary in their department?

Explanation Explanation/Reference: Answer: SELECT ename, sal, deptno, AVG(sal) FROM emp GROUP BY ename, sal, deptno


Question ID 8109

Mr. Bill is the president of a company. Five managers report to him. All other employees report to these managers. Examine the code. SELECT employee.ename FROM emp employee WHERE employee.empno not in SELECT manager.mgr FROM emp manager; The above statement returns no rows selected as the result why?

Option A

All employees have a manager.

Option B

None of the employees have a manager.

Option C

A null value is returned from the sub query.

Option D

Operator is not allowed in sub queries.

Correct Answer C
Explanation Explanation/Reference: Explanation: Answer C is correct because a null value is returned from the sub query (president of a company does not have manager for himself). Incorrect Answers: A: Not ALL employees have a manager. B: Some of the employees have a manager. D: Statement is correct, all operators is used correctly. Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 64-72 Chapter 5: Advanced Data Selection in Oracle

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