exp_002.htm

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<p><b><span style="font-size:22pt">Explaination 002: &nbsp;</span></b></p>


	<p>
	<span style="font-size:18pt">Since EMPLOYEE_ID column is used as primary key, it cannot be NULL, so only INSERT statements in C, E and F are correct. You can insert the row with NULL LAST_NAME as in answer C, or only the row with EMPLOYEE_ID as in answer E, or the row with empty LAST_NAME column. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">Incorrect Answers <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">A: This answer is incorrect because a primary key cannot be NULL. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">B: INSERT statement does not contain primary key value at all, so this answer needs to be eliminated as correct one. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">D: This statement shows incorrect order of columns of row which needs to be inserted into the table. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 260-267 <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">Chapter 6: Manipulating Oracle Data
	</span></p>

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