exp_111.htm

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<p><b><span style="font-size:22pt">Explaination 111: &nbsp;</span></b></p>

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	<p>
	Constraints can be created after the table is created. Use ALTER TABLE command for that. <br>
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	<p>
	  Constraints can be created at the same time the table is created (CREATE TABLE command). <br>
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	<p>
	  Incorrect Answers <br>
	</p>

	<p>
	  A: There is no requirements in Oracle that constraint names must start with SYS_C. Oracle can use prefix "SYS" to build indexes for UNIQUE and NOT NULL constraints, but it is not required for user to follow this naming rule. <br>
	</p>

	<p>
	  B: Not all constraints must be defines at the column level. Only NOT NULL constraint must be. <br>
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	<p>
	  E: There is no VIEW_CONSTRAINTS dictionary view in Oracle. <br>
	</p>

	<p>
	  OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 227-232 <br>
	</p>

	<p>
	  Chapter 5: Creating Oracle Database Objects
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