exp_038.htm

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<title>Ocp test </title>
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<p><b><span style="font-size:22pt">Explaination 038: &nbsp;</span></b></p>

<span style="font-size:18pt">
	<p>
	This statement lists the ID, name, and salary of the employee, and the ID and name of the<br>
	</p>

	<p>
	  employee's manager, for all the employees who have a manager and earn more than 4000 Incorrect Answers <br>
	</p>

	<p>
	  A: This statement does not check does employee have a manager or not, so it will not provide correct result. <br>
	</p>

	<p>
	  B: Usage of "e.mgr_id = m.mgr_id" condition is wrong to achieve required result. <br>
	</p>

	<p>
	  D: This statement uses "m.mgr_id" to show manager's manager, not employ's manager. <br>
	</p>

	<p>
	  E: Usage of "WHERE e.employee_id = m.employee_id" condition is wrong to achieve required result. <br>
	</p>

	<p>
	  OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 118-122 <br>
	</p>

	<p>
	  Chapter 3: Advanced Data Selection in Oracle
	</p>

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