exp_087.htm

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<p><b><span style="font-size:22pt">Explaination 087: &nbsp;</span></b></p>

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	<p>
	The main query fails because the multiple-row sub-query cannot be used with the comparison operator. Only single-row query can use comparison operators, like =, <, >, <=, >, and <>. <br>
	</p>

	<p>
	  Incorrect Answers <br>
	</p>

	<p>
	  A: The main query fails because the multiple-row sub-query cannot be used with the comparison operator. <br>
	</p>

	<p>
	  B: The main query fails because the multiple-row sub-query cannot be used with the comparison operator. <br>
	</p>

	<p>
	  C: The main query fails because the multiple-row sub-query cannot be used with the comparison operator. <br>
	</p>

	<p>
	  E: You can define a multiple-row sub-query in the WHERE clause of a SQL query, but error will be generated by different reason. <br>
	</p>

	<p>
	  OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 150-165 <br>
	</p>

	<p>
	  Chapter 4: Subquerie
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