exp_023.htm

来自「oracle　DBA的资料」· HTM 代码 · 共 39 行

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<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<title>Ocp test </title>
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<body bgcolor="white" text="black" link="blue" vlink="purple" alink="red">
<p><b><span style="font-size:22pt">Explaination 023: &nbsp;</span></b></p>

<span style="font-size:18pt">
	<p>
	The statement returns an error at the WHERE clause because group function AVG() cannot be used in the WHERE clause. Group functions can be used in SELECT clause and GROUP BY clause. They allow you to perform data operations on several values in a column of data as though the column were one collective group of data. <br>
	</p>

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

	<p>
	  A: The statement does not execute successfully because an error will be generated. <br>
	</p>

	<p>
	  B: The statement returns an error at the WHERE, not at the SELECT clause. <br>
	</p>

	<p>
	  D: The statement returns an error at the WHERE, not at the ORDER BY clause. <br>
	</p>

	<p>
	  OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 122-125 <br>
	</p>

	<p>
	  Chapter 3: Advanced Data Selection in Oracl
	</p>

</span>
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