exp_168.htm
来自「oracle DBA的资料」· HTM 代码 · 共 38 行
HTM
38 行
<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 168: </span></b></p>
<span style="font-size:18pt">
<p>
subquery can retrieve zero or more rows, subquery is used with an inequality camparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column. <br>
</p>
<p>
Incorrect answer : <br>
</p>
<p>
A subquery can retrieve zero or more rows <br>
</p>
<p>
C subquery is not SQL query statement <br>
</p>
<p>
D subquery can be nested <br>
</p>
<p>
E group function can be use with subquery
</p>
</span>
</body>
</html>
⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?