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<p><b><span style="font-size:22pt">Explaination 086: &nbsp;</span></b></p>

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	Constraints have functions to enforce rules at the view and table levels and to prevent the deletion of data if dependencies exist between tables. <br>
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	  Incorrect Answers <br>
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	  A: Constraints are used to put dependencies on data. <br>
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	  B: Constrains are not used to make complex queries more easy. <br>
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	  F: Constraints does not prevent the deletion of an index if there are dependencies. <br>
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	  OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 227-248 <br>
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	<p>
	  Chapter 5: Creating Oracle Database Objects
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