que_168.htm

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<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<title>Ocp test </title>
</head>
<body bgcolor="white" text="black" link="blue" vlink="purple" alink="red">
<p align="left" color="black" style="font-size:16pt;">
	<b>QUESTION 168	</b>
</p><hr color="#99CCFF">

<p>Which two statements about subqueries are true? (Choose two.) </p><table border="1" bordercolor="gray" width="665">
	<form name="youAnsForm">
	<span style="font-size:18pt;">
	<tr>
		<td align="center" width="89">
			<p><b><input type="checkbox" name="AN" value="A">  A.</b></p>
		</td>
		<td align="left" width="566">
			<p> A subquery should retrieve only one row. 
			</p>
		</td>
	</tr>
	<tr>
		<td align="center" width="89">
			<p><b><input type="checkbox" name="AN" value="B">  B.</b></p>
		</td>
		<td align="left" width="566">
			<p>   A subquery can retrieve zero or more rows. 
			</p>
		</td>
	</tr>
	<tr>
		<td align="center" width="89">
			<p><b><input type="checkbox" name="AN" value="C">  C.</b></p>
		</td>
		<td align="left" width="566">
			<p>   A subquery can be used only in SQL query statements. 
			</p>
		</td>
	</tr>
	<tr>
		<td align="center" width="89">
			<p><b><input type="checkbox" name="AN" value="D">  D.</b></p>
		</td>
		<td align="left" width="566">
			<p>   Subqueries CANNOT be nested by more than two levels. 
			</p>
		</td>
	</tr>
	<tr>
		<td align="center" width="89">
			<p><b><input type="checkbox" name="AN" value="E">  E.</b></p>
		</td>
		<td align="left" width="566">
			<p>   A subquery CANNOT be used in an SQL query statement that uses group functions. 
			</p>
		</td>
	</tr>
	<tr>
		<td align="center" width="89">
			<p><b><input type="checkbox" name="AN" value="F">  F.</b></p>
		</td>
		<td align="left" width="566">
			<p>   When a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.</b></p>
		</td>
	</tr>
	</span>
	</form>
</table>

</body>
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