📄 exp_087.htm

📁 oracle　DBA的资料

💻 HTM

字号:

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

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

</span>

</body>
</html>
<br>

⌨️ 快捷键说明

复制代码 Ctrl + C

搜索代码 Ctrl + F

全屏模式 F11

切换主题 Ctrl + Shift + D

显示快捷键 ?

增大字号 Ctrl + =

减小字号 Ctrl + -