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<p><b><span style="font-size:22pt">Explaination 013: &nbsp;</span></b></p>


	<p>
	<span style="font-size:18pt">This statement provides correct syntax to add a primary key on the STUDENT_ID column of the STUDENT table. <br>
	</span></p>

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

	<p>
	  <span style="font-size:18pt">A: This ALTER TABLE statement is missing CONSTRAINT keyword and the name of the constraint. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">B: This ALTER TABLE statement is missing the name of the constraint. <br>
	</span></p>

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	  <span style="font-size:18pt">C: It's incorrect syntax in the ALTER TABLE command: STUDENT_ID must be used with 	  brackets. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">E: We need to add constraint, not to modify existing one. Usage of the MODIFY keyword is incorrect in this case. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 239-240 <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">Chapter 5: Creating Oracle Database Objects
	</span></p>

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