📄 exp_049.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 049: </span></b></p>
<span style="font-size:18pt">
<p>
Expression SYSDATE-HIRE_DATE will show number of days after date of hiring employee, so you need to divide result of expression on 365 and this compare result with 5. <br>
</p>
<p>
Incorrect Answers <br>
</p>
<p>
A: This query returns all employees who were hired more than 5 days ago. <br>
</p>
<p>
B: This query will not return any record because result of HIRE_DATE-SYSDATE expression will be negative number. <br>
</p>
<p>
D: You need to divide, not to multiply, SYSDATE-HIRE_DATE on the number of days in 1 year. <br>
</p>
<p>
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 81-85 <br>
</p>
<p>
Chapter 2: Limiting, Sorting, and Manipulating Return Data
</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 + -