exp_057.htm

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<title>Ocp test </title>
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<p><b><span style="font-size:22pt">Explaination 057: &nbsp;</span></b></p>


	<p>
	<span style="font-size:18pt">Tables that underlie views often have constraints that limit the data that can be added to those tables. Views cannot add data to the underlying table that would violate the table's constraints. However, you can also define a view to restrict the user's ability to change underlying table data even further, effectively placing a special constraint for data manipulation through the view. This additional constraint says that INSERT or UPDATE
	  statements issued against the view are cannot create rows that the view cannot subsequently select. This constraint is configured when the view is defined by adding the WITH CHECK OPTION to the CREATE VIEW statement. <br>
	</span></p>

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

	<p>
	  <span style="font-size:18pt">A: This view does not provide correct semantic of question task. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">B: WITH READ ONLY clause is incorrect syntax in the CREATE VIEW command. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">D: This view does not provide correct semantic of question task. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">E: NO UPDATE clause is incorrect syntax in the CREATE VIEW command. <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 301-303 <br>
	</span></p>

	<p>
	  <span style="font-size:18pt">Chapter 7: Creating Other Database Objects in Oracle
	</span></p>

<br></span>

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