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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <script src="./callback.js" type="text/javascript"></script> <noscript>Your browser does not support JavaScript. This help page requires JavaScript to render correctly.</noscript> </head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <meta http-equiv="Content-Script-Type" content="text/javascript" /> <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1.1 Build 005" /> <meta name="date" content="2009-04-21T9:46:24Z" /> <meta name="robots" content="noarchive" /> <meta name="doctitle" content="Using the IF Statement" /> <meta name="relnum" content="11g Release 2 (11.2)" /> <meta name="partnum" content="E10766-01" /> <link rel="copyright" href="./dcommon/html/cpyr.htm" title="Copyright" type="text/html" /> <link rel="stylesheet" href="./dcommon/css/blafdoc.css" title="Oracle BLAFDoc" type="text/css" /> <link rel="contents" href="toc.htm" title="Contents" type="text/html" /> <link rel="prev" href="tdddg_subprograms026.htm" title="Previous" type="text/html" /> <link rel="next" href="tdddg_subprograms028.htm" title="Next" type="text/html" /> <title>Using the IF Statement</title> </head> <body> <div class="zz-skip-header"><a href="#BEGIN">Skip Headers</a></div> <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> <col width="86%" /> <col width="*" /> <tr valign="bottom"> <td align="left"></td> <td align="center"><a href="tdddg_subprograms026.htm"><img width="24" height="24" src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdddg_subprograms028.htm"><img width="24" height="24" src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="BABDFCCI" name="BABDFCCI"></a><a id="TDDDG44110" name="TDDDG44110"></a></p> <div class="sect2"><!-- infolevel="all" infotype="General" --> <h1>Using the IF Statement</h1> <a name="BEGIN" id="BEGIN"></a> <p><a id="sthref425" name="sthref425"></a><a id="sthref426" name="sthref426"></a>The <code>IF</code> statement either executes or skips a sequence of statements, depending on the value of a Boolean expression.</p> <p>The <code>IF</code> statement has this syntax:</p> <pre xml:space="preserve" class="oac_no_warn"> IF <span class="italic">boolean_expression</span> THEN <span class="italic">statement</span> [, <span class="italic">statement</span> ] [ ELSEIF <span class="italic">boolean_expression</span> THEN <span class="italic">statement</span> [, <span class="italic">statement</span> ] ]... [ ELSE <span class="italic">statement</span> [, <span class="italic">statement</span> ] ] END IF; </pre> <p>Suppose that your company evaluates employees twice a year in the first 10 years of employment, but only once a year afterward. You want a function that returns the evaluation frequency for an employee. You can use an <code>IF</code> statement to determine the return value of the function, as in the following example.</p> <p>Add the <code>eval_frequency</code> function to the body of the <code>EMP_EVAL</code> package, but not to the specification. Because it is not in the specification, <code>eval_frequency</code> is local to the package—it can be invoked only by other subprograms in the package, not from outside the package.</p> <div class="example"><a id="BABEIIJG" name="BABEIIJG"></a><a id="TDDDG229" name="TDDDG229"></a> <p class="titleinexample">IF Statement that Determines Return Value of Function</p> <pre xml:space="preserve" class="oac_no_warn"> FUNCTION eval_frequency (emp_id IN EMPLOYEES.EMPLOYEE_ID%TYPE) RETURN PLS_INTEGER AS h_date EMPLOYEES.HIRE_DATE%TYPE; today EMPLOYEES.HIRE_DATE%TYPE; eval_freq PLS_INTEGER; BEGIN SELECT SYSDATE INTO today FROM DUAL; SELECT HIRE_DATE INTO h_date FROM EMPLOYEES WHERE EMPLOYEE_ID = emp_id; <span class="bold">IF</span> ((hire_date + (INTERVAL '120' MONTH)) < today) <span class="bold">THEN</span> eval_freq := 1; <span class="bold">ELSE</span> eval_freq := 2; <span class="bold">END IF</span>; RETURN eval_freq; END eval_frequency; </pre></div> <!-- class="example" --> <div class="helpinfonotealso"> <h2>Related Topics</h2> <p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS01324','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a> for the syntax of the <code>IF</code> statement</p> <p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS00402','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a> for more information about using the <code>IF</code> statement</p> <p><a href="tdddg_subprograms025.htm#CIHHFJFJ">Controlling Program Flow</a></p> </div> </div> <!-- class="sect2" --> <!-- Start Footer --> <div class="footer"> <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> <col width="86%" /> <col width="*" /> <tr> <td align="left"><span class="copyrightlogo">Copyright © 1996, 2009, Oracle and/or its affiliates. All rights reserved.</span><br /> <a href="./dcommon/html/cpyr.htm"><span class="copyrightlogo">Legal Notices</span></a></td> <td align="center"><a href="tdddg_subprograms026.htm"><img width="24" height="24" src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdddg_subprograms028.htm"><img width="24" height="24" src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> </div> <!-- class="footer" --> </body> </html>
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